Crossword Genius

Fool may be unwelcome pain in the backside (5)

Ross

I believe the answer is:

goose

I'm a little stuck... Click here to teach me more about this clue!

'fool' is the definition.
(goose is a kind of fool)

'be unwelcome pain in the backside' is the wordplay.
I cannot really understand how this works, but
'be' could be 'go' (going is a kind of being) and 'go' is found in the answer.
This may be the basis of clue (or it may be nonsense).

'may' acts as a link.

Can you help me to learn more?

(Other definitions for goose that I've seen before include "Grab seat" , "Silly person" , "Migratory aquatic bird" , "Web-footed long-necked bird" , "Pimply state of the skin when cold or scared (with a bird)" .)

I've seen this clue in The Independent.
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