In den, try cooking (6)
I believe the answer is:
trendy
'in' is the definition.
('in' can mean trendy or fashionable)
'den try cooking' is the wordplay.
'cooking' is an anagram indicator (cook can mean to falsify or distort).
'den'+'try'='dentry'
'dentry' anagrammed gives 'TRENDY'.
(Other definitions for trendy that I've seen before include "Cool" , "Up-to-date with the latest fad" , "Fashionable, in style" , "Stylish" , "Consciously fashionable" .)