Crossword Genius

Quickly passes 'Men's Trousers Feature' — heartless youth! (5,2)

Ross

I believe the answer is:

flies by

'quickly passes' is the definition.
(as in time flying by)

'men's trousers feature heartless youth' is the wordplay.
'men's trousers feature' becomes 'flies' (men's trousers have flies on them).
'heartless' means to remove the middle letters.
'youth' becomes 'boy' (I've seen this before).
'boy' with its middle removed is 'by'.
'flies'+'by'='FLIES BY'

I've seen this clue in The Guardian.
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