Is no longer a swinger? That's pungent (6)
I believe the answer is:
wasabi
'that's pungent' is the definition.
(wasabi has a strong smell)
'is no longer a swinger?' is the wordplay.
'is no longer' becomes 'was' (eg if someone 'was' sad, they're no longer sad).
'swinger?' becomes 'bi' (bisexual, someone who 'swings both ways' sexually).
'was'+'a'+'bi'='WASABI'
(Other definitions for wasabi that I've seen before include "Pungent green paste used in Japanese cuisine" , "condiment? Japanese actually" , "Pungent green root used in Japanese cookery" , "Pungent green root, used in Japanese cooking" , "Strong-tasting Japanese paste" .)