Try out, for purpose, what's fashionable (6)

I believe the answer is:

trendy

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'fashionable' is the definition.
(similar in meaning)

'try out for purpose what's' is the wordplay.
'out' means to remove the last letter.
'for' is a charade indicator (letters next to each other).
'purpose' becomes 'end' (both can mean a goal).
'what's' becomes 'y' (I can't explain this - if you can you should believe this answer much more).
'try' with its last letter removed is 'tr'.
'tr'+'end'+'y'='TRENDY'

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(Other definitions for trendy that I've seen before include "Consciously fashionable" , "With it, a la mode" , "In fashion, of popular style" , "In vogue" , "With-it" .)

I've seen this clue in the Evening Standard.

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