Nice fat person looking to buy a small jumper (11)
I believe the answer is:
grasshopper
'a small jumper' is the definition.
(I've seen this before)
'nice fat person looking to buy' is the wordplay.
I cannot really understand how this works, but
'person' could be 'shopper' (shopper is a kind of person) and 'shopper' is found in the answer.
The remaining letters 'gras' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for grasshopper that I've seen before include "Type of cricket" , "six-footer with extra powerful legs" , "Chirping insect" , "small jumper" , "Jumping insect" .)