The most common and most likely answer to this crossword clue is the 5 letter word SCALP
I've seen this crossword clue in The Guardian
S
C
A
L
P
More clues leading to the result SCALP
Buddy explains!

The straight part
We know that "trophy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trophy = scalp.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SCALP mean?
SCALP noun- The top of the head; the skull.
- The part of the head where the hair grows from, or used to grow from.
- A part of the skin of the head, with the hair attached, formerly cut or torn off from an enemy by warriors in some cultures as a token of victory.
- The skin of the head of a stag with the horns attached.
- A victory, especially at the expense of someone else.
- A bed or stratum of shellfish.
- The top; the summit.
- To remove the scalp (part of the head from where the hair grows), by brutal act or accident.
- To resell, especially tickets, usually for an inflated price, often illegally.
- On an open outcry exchange trading floor, to buy and sell rapidly for one's own account, aiming to buy from a seller and a little later sell to a buyer, making a small profit from the difference (roughly the amount of the bid/offer spread, or less).
- To screen or sieve ore before further processing.
- To remove the skin of.
- To remove the grass from.
- To destroy the political influence of.
- (milling) To brush the hairs or fuzz from (wheat grains, etc.) in the process of high milling.