Bird with an enormous man (5)
I believe the answer is:
titan
'enormous man' is the definition.
'titan' can be an answer for 'man' (I have seen 'Great man' mean 'titan' so perhaps 'man' could also mean 'titan'). I'm unsure of the 'enormous' bit.
'bird with an' is the wordplay.
'bird' becomes 'tit' (tit is a kind of bird).
'with' means one lot of letters go next to another.
'tit'+'an'='TITAN'
Can you help me to learn more?
(Other definitions for titan that I've seen before include "Jolly large figure" , "Saturn's moon" , "Taint in a legendary giant" , "Taint in a mythical giant" , "One huge" .)