Quickly regard appreciative audience (4,3,8)
I believe the answer is:
like the clappers
'quickly' is the definition.
(I've seen this before)
'regard appreciative audience' is the wordplay.
'regard' becomes 'like' (liking is a kind of regarding).
'appreciative' becomes 'the' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'audience' becomes 'clappers'.
'like'+'the'+'clappers'='LIKE THE CLAPPERS'
Can you help me to learn more?
(Other definitions for like the clappers that I've seen before include "Entertainers do this" , "very fast!" , "Very quickly" , "appreciate those people giving one a hand" , "enjoy an appreciative audience" .)