Always turning up in Tupperware, vegetables (4)
I believe the answer is:
ever
'always' is the definition.
(synonyms)
'turning up in tupperware vegetables' is the wordplay.
'turning up' shows that the letters should be reversed in order.
'in' indicates a hidden word.
'reve' is hidden within 'tupperware vegetables'.
'reve' written backwards gives 'EVER'.
(Other definitions for ever that I've seen before include "At all times, always" , "Perpetually" , "In perpetuity" , "Continually" , "Veer away endlessly" .)