Very strong big man, Brown eats it (5)
I believe the answer is:
titan
'very strong big 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 not sure about the 'very strong big' bit.
'brown eats it' is the wordplay.
'brown' becomes 'tan' (tan is a kind of brown).
'eats' is an insertion indicator.
'tan' enclosing 'it' is 'TITAN'.
Can you help me to learn more?
(Other definitions for titan that I've seen before include "Saturn's largest satellite" , "Taint in a legendary giant" , "Person of great strength - moon of Saturn" , "bigwig" , "Taint (anag.)" .)