Hearten (5)
I believe the answer is:
cheer
'hearten' is the definition.
(I know that hearten can be written as cheer)
This is the entire clue.
(Other definitions for cheer that I've seen before include "Encouraging shout" , "Applaud vocally, hurray etc" , "Shout hooray" , "Give comfort or support to" , "pair of hips can get me going!" .)