20 down
Stylish
attempt
to
cover
butt
(6)
Stylish attempt to cover butt (6)
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The definition is at the beginning of the clue.
How the clue works
Right, so stylish is your definition, pointing to TRENDY. For the wordplay, take TRY (a word for attempt) and stuff END (a synonym for butt) inside it, giving you TR-END-Y.