Like certain sisters said 'fruit' (4)
I believe the answer is:
ugly
'like certain sisters said fruit' is the definition.
I can't tell whether this definition defines the answer.
'said fruit' is the wordplay.
'said' shows a homophone (sound like).
'fruit' becomes 'ugli' (ugli fruit is a kind of fruit).
'ugli' sounds like 'UGLY'.
Can you help me to learn more?
(Other definitions for ugly that I've seen before include "Unsightly, not pretty" , "Offensive to one's sight or other senses" , "'Unattractive, unsightly (4)'" , "Unpleasing to the eye" , "Grotesque" .)