Variety of apricot not right with a kind of pudding (7)
I believe the answer is:
tapioca
'kind of pudding' is the definition.
'variety of apricot not right with a' is the wordplay.
'variety of' indicates an anagram.
'not' suggests deleting specific letters.
'right' becomes 'r' (common abbreviation).
'with' means one lot of letters goes inside another.
'apricot' with 'r' taken out is 'apicot'.
'apicot' anagrammed gives 'tpioca'.
'tpioca' placed around 'a' is 'TAPIOCA'.
(Other definitions for tapioca that I've seen before include "Foodstuff used as a thickener" , "Starchy food" , "Starchy pudding" , "Starchy dish" , "Sago pudding" .)