Attempt to conceal butt and hip (6)
I believe the answer is:
trendy
'hip' is the definition.
(I've seen this before)
'attempt to conceal butt' is the wordplay.
'attempt' becomes 'try' (synonyms).
'to conceal' means one lot of letters goes inside another.
'butt' becomes 'end' (I've seen this in other clues).
'try' placed around 'end' is 'TRENDY'.
'and' acts as a link.
(Other definitions for trendy that I've seen before include "In accordance with the latest fad" , "all the rage" , "Fashionable, in style" , "Consciously fashionable" , "Stylish" .)