Well versed in guns, is peeved (2,2,4)
I believe the answer is:
up in arms
'peeved' is the definition.
(I've seen this in another clue)
'well versed in guns' is the wordplay.
I cannot quite see how this works, but
'in' is present in the answer.
'guns' could be 'arms' (I've seen this in another clue) and 'arms' is present in the answer.
The remaining letters 'up' 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).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for up in arms that I've seen before include "Weapons expert should be" , "Prepared to protest strongly" , "Involved in protest" , "held like a small child" , "Young child may be found here" .)