Appreciation shown by clapping (8)
I believe the answer is:
applause
'appreciation shown by clapping' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for applause that I've seen before include "Audible indication of approval or praise" , "Appreciative claps" , "Burst of clapping" , "Acclamation" , "loud support" .)