Man of perception (3)
I believe the answer is:
ken
I believe this clue is a double definition.
'man' is the first definition.
(short for Kenneth)
'perception' is the second definition.
(I've seen this in another clue)
'of' is the link.
(Other definitions for ken that I've seen before include "Identify; -- Livingstone" , "Awareness" , "Understanding - boy's name" , "One's range of knowledge" , "Know; man's name" .)