Beat twice, to get collection (4-5)
I believe the answer is:
whip-round
'collection' is the definition.
(I know that whip-round is a type of collection)
'beat twice' is the wordplay.
'beat twice' can mean two substitutions for 'beat'.
'beat' becomes 'whip' (whipping is a kind of beating).
'beat' becomes 'round' (synonyms).
'whip'+'round'='WHIP-ROUND'
'to get' is the link.
(Other definitions for whip-round that I've seen before include "An office collection as for someone retiring" , "Collection of money as in office" , "Quick collection of cash contributions" , "Collection of money from members of group" , "Impromptu collection of money" .)