Crossword Genius

One clicks what St Peter might have done (8)

Ross

I believe the answer is:

castanet

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

'peter might have done' is the definition.
I can't judge whether this definition defines the answer.

'one clicks what st' is the wordplay.
I cannot really see how this works, but
'one' could be 'ane' (synonyms) and 'ane' is found within the answer.
'st' is found in the answer.
The remaining letters 'cat' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for castanet that I've seen before include "Single Spanish percussion" , "Scant tea (anag.)" , "One of a pair in Spanish music" , "something resembling a shell" , "Spanish clicker" .)

I've seen this clue in The Guardian.
Want a hint initially instead of a full solution? Install my app