Big gun (6)
'big gun' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cannon that I've seen before include "Caught girl on piece of artillery" , "Large artillery piece" , "Great gun" , "Weapon firing large balls" , "Billiard shot or large gun" .)
'big gun' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for mogul that I've seen before include "Powerful man" , "big shot" , "Indian emperor - important person" , "bigwig" , "Magnate; mound of hard snow on a ski slope" .)