A he-man's bird? (5)
I believe the answer is:
heron
'bird?' is the definition.
(heron is a kind of bird)
'a he-man's' is the wordplay.
'man' becomes 'ron' (I've seen this before**).
'he'+'ron'='HERON'
(Other definitions for heron that I've seen before include "Tall wading bird" , "Wading bird with long neck and legs" , "Bird of the Rhone, strangely" , "Rhone (anag) - bird" , "Long-legged long-necked wading bird" .)