Crossword Genius

A threesome firmly quashed -- loser, big time! (7)

Ross

I think it could be either:

Which length description are you looking for?:

7

7,2,3,4

slimmer of the year

'loser big time' is the definition.

'a threesome firmly quashed' is the wordplay.
'quashed' indicates anagramming the letters (quash can mean to smash up).
'a'+'threesome'+'firmly'='athreesomefirmly'
'athreesomefirmly' anagrammed gives 'SLIMMER OF THE YEAR'.

I've seen this clue in The Guardian.
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