Trophy lost by a head (5)
I believe the answer is:
scalp
'trophy' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for scalp that I've seen before include "Skin covering top of the head" , "Hair producer" , "Skin with hair as trophy" , "Token of victory" , "Clasp (anag)" .)