Nothing very revolting for Yank's picnic (4,4)
I believe the answer is:
duck soup
'picnic' is the definition.
(I know that picnic can be written as duck soup)
'nothing very revolting for yank's' is the wordplay.
I cannot really see how this works, but
'nothing' could be 'duck' (duck means zero in cricket) and 'duck' is found in the answer.
'very' could be 'so' (both can mean 'extremely') and 'so' is located in the answer.
'revolting' could be 'up' (rising up or revolting) and 'up' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for duck soup that I've seen before include "From comic film" , "Classic film" , "An easy task" , "funny film" , "Marx Brothers film" .)