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 really see how this works, but
'in' is within the answer.
'guns' could be 'arms' (I've seen this in another clue) and 'arms' is found within the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'is' is the 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" .)