He-man, this flier? (5)
I believe the answer is:
heron
'this flier?' is the definition.
(heron is a kind of birdanimal)
'he-man' is the wordplay.
'man' becomes 'ron' (I've seen this before**).
'he'+'ron'='HERON'
(Other definitions for heron that I've seen before include "Large fish-eating bird" , "eg Egret" , "Wading bird with long neck and legs" , "Graceful grey bird with long neck" , "Grey or white long-legged wading bird" .)