Man mountain? (3)
I believe the answer is:
ben
I believe this is a double definition.
'man' is the first definition.
'mountain?' is the second definition.
(as in Ben Nevis)
(Other definitions for ben that I've seen before include "High mountain (Scots)" , "Mountain peak (Scot.)" , "High mountain in Scotland" , "Boy for a Scottish mountain" , "Big . . . is a famous London clock-tower" .)