Cross-examine gunner out of sorts (5)
I believe the answer is:
grill
'cross-examine' is the definition.
(thesaurus)
'gunner out of sorts' is the wordplay.
'gunner' becomes 'gr' (I can't explain this - if you can you should give a lot more credence to this answer).
'out of sorts' becomes 'ill' (I've seen this before).
'gr'+'ill'='GRILL'
Can you help me to learn more?
(Other definitions for grill that I've seen before include "Cooking device" , "Do well" , "Screen" , "Question aggressively" , "pump" .)