Involve last of fruit in a line, stewed (6)
I believe the answer is:
entail
'involve' is the definition.
(entail means to involve or require)
'last of fruit in a line stewed' is the wordplay.
'last of' suggests the final letters.
'in' indicates putting letters inside.
'stewed' indicates an anagram.
The final letter of 'fruit' is 't'.
'a'+'line'='aline'
'aline' is an anagram of 'enail'.
't' placed into 'enail' is 'ENTAIL'.
(Other definitions for entail that I've seen before include "Bring on, involve" , "Involve or require" , "settlement of estate" , "Estate settled" , "Cut" .)