Perceive hare running (4)
I believe the answer is:
hear
'perceive' is the definition.
(I know that hear is a more specific form of the action perceive)
'hare running' is the wordplay.
'running' is an anagram indicator (the letters run around to different places).
'hare' is an anagram of 'HEAR'.
(Other definitions for hear that I've seen before include "learn" , "attend" , "receive information" , "Pay attention" , "Listen to" .)