Young bird almost trendy (4)
I believe the answer is:
chic
'trendy' is the definition.
(I've seen this in another clue)
'young bird almost' is the wordplay.
'young bird' becomes 'chick' (I've seen this in another clue).
'almost' means to remove the last letter (most of the word but not all of it).
'chick' with its last letter removed is 'CHIC'.
(Other definitions for chic that I've seen before include "Smart and stylish, in a French kind of way" , "cool" , "Smart - elegant - fashionable" , "A la mode" , "Elegantly fashionable" .)