Shout about bananas ban leading to sin with fruit (9)
I believe the answer is:
cranberry
'fruit' is the definition.
(cranberry is a kind of fruit)
'shout about bananas ban leading to sin' is the wordplay.
'shout' becomes 'cry' (synonyms).
'about' means one lot of letters goes inside another.
'bananas' is an anagram indicator (informal term for mad).
'leading to' says to put letters next to each other (some letters go before or lead others).
'sin' becomes 'err' (to sin is to err morally).
'ban' is an anagram of 'anb'.
'anb'+'err'='anberr'
'cry' going around 'anberr' is 'CRANBERRY'.
'with' is the link.
(Other definitions for cranberry that I've seen before include "The sauce for Christmas turkey" , "The sauce or jelly to go with turkey" , "Red fruit in a Christmas sauce" , "Shrub with red fruit" , "Traditional sauce to go with turkey" .)