Baguette conceivably a source of irritation (4)
I believe the answer is:
pain
'irritation' is the definition.
(thesaurus)
'baguette conceivably a source' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
The remaining letters 'pin' 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).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for pain that I've seen before include "French bread?" , "Hurt feeling" , "can cause discomfort" , "Physical discomfort" , "great discomfort" .)