Funds to frighten money-spinner (4,3)
I believe the answer is:
cash cow
'money-spinner' is the definition.
(synonyms)
'funds to frighten' is the wordplay.
'funds' becomes 'cash' (I've seen this before).
'to frighten' becomes 'cow' (I can't justify this - if you can you should believe this answer much more).
'cash'+'cow'='CASH COW'
Can you help me to learn more?
(Other definitions for cash cow that I've seen before include "Money-spinning business" , "Money-maker" , "producing high market share" , "Product or business making easy money" , "profitable business" .)