Rapture! Fig cultivated as a possible basis for a fad diet (10)
I believe the answer is:
grapefruit
'a possible basis for a fad diet' is the definition.
'rapture fig cultivated' is the wordplay.
'cultivated' indicates anagramming the letters.
'rapture'+'fig'='rapturefig'
'rapturefig' is an anagram of 'GRAPEFRUIT'.
'as' is the link.
I've seen this clue in The Guardian.
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