Mighty Egyptian, huge deity (6)
I believe the answer is:
osiris
'mighty egyptian huge deity' is the definition.
'osiris' can be an answer for 'deity' (Osiris is an example). I am not certain of the 'mighty egyptian huge' bit.
'huge deity' is the wordplay.
'huge' becomes 'os' (abbreviation for outsize).
'deity' becomes 'iris' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'os'+'iris'='OSIRIS'
Can you help me to learn more?
(Other definitions for osiris that I've seen before include "one held to be divine" , "Egyptian deity" , "one Egyptians worshipped" , "once highly esteemed by Egyptians" , "Egyptian god of the underworld" .)