Only man the guns coming back (4)
I believe the answer is:
stag
'only man' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'the guns coming back' is the wordplay.
'the guns' becomes 'gats' (gat is a kind of gun).
'coming back' says the letters should be written backwards.
'gats' back-to-front is 'STAG'.
Can you help me to learn more?
(Other definitions for stag that I've seen before include "Horned animal" , "Sort of party" , "Male-only" , "Stockmarket operator gambling on a quick profit" , "one may get in a rut" .)