Herb said to go with fish or fruit (7)
I believe the answer is:
rhubarb
'fruit' is the definition.
(I've seen this before)
'herb said to go with' is the wordplay.
'herb' becomes 'rue' (rue is a herb).
'said' shows a homophone (sound like).
'to go with' becomes 'barb' (I can't explain this - if you can you should believe this answer much more).
'rue' is a homophone of 'rhu'.
'rhu'+'barb'='RHUBARB'
'fish or' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for rhubarb that I've seen before include "Plant with thick stalks that are cooked in desserts" , "Fruit - nonsense!" , "Noise of actors simulating conversation" , "Stalks edible when cooked" , "Plant in the dock family" .)