At sea with undisciplined airmen! (6)
I believe the answer is:
marine
'at sea' is the definition.
'marine' can be an answer for 'sea' (I've seen this before). I am unsure of the 'at' bit.
'undisciplined airmen' is the wordplay.
'undisciplined' indicates anagramming the letters.
'airmen' anagrammed gives 'MARINE'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for marine that I've seen before include "Airmen (anag.)" , "jolly" , "Sea-soldier" , "Soldier associated with a navy" , "Relating to the sea" .)