Yes. A partial refund is money back while you keep the item, and for a small flaw on something awkward to post it is the sensible answer for everybody.
When it is the right ask
A flaw that was not described, but not bad enough to return. A mark on a dress you will still wear. A scuff on a frame. A missing spare button.
Something heavy or fragile. Return postage on a 4kg item can cost more than the flaw is worth, and sending it back risks damage that is nobody's fault.
A part missing from a set. You want the set, minus the value of the missing piece.
When it is not
The item is wrong, broken or not what was described at all. That is a return and a full refund, and you should not be talked into keeping something you cannot use.
You have changed your mind. A change of mind is a return under the store's policy, not a discount after the fact.
How it works
Ask the seller, from the order. Say what the flaw is, ideally with a photo, and name a figure — "there's a 3cm mark on the back that wasn't in the photos; would ₹300 back be fair?"
Naming a number is the whole trick. "Can I have something off?" takes four messages; a specific figure takes one reply.
The seller can refund any amount up to what you paid. A partial refund keeps the order a sale, which is why sellers like it: they keep most of the sale, you keep the item, nobody pays postage twice.
If they say no
Then the choice is to keep it as it is or return it under the normal rules. A faulty, damaged, wrong or misdescribed item is returnable for 7 days, whatever your returns policy says — so if the flaw was genuinely not described, you have not lost that option by asking.
If a return is already open
Ask there rather than separately. A refund issued outside the return leaves the return sitting open, which helps nobody.
From the seller's side
If you are reading this as a seller: offer the partial before a dispute is opened. One you propose in the first hour costs you less than one decided for you two days later, and it usually keeps the buyer.
More: how refunds work, how returns work, who pays to send something back.