Remains with company in outskirts of Cracow, a money-spinner (4,3)
I believe the answer is:
cash cow
'a money-spinner' is the definition.
('cash cow' can be a synonym of 'money-spinner')
'remains with company in outskirts of cracow' is the wordplay.
'remains' becomes 'ash' (I've seen this before).
'with' means one lot of letters go next to another.
'company' becomes 'co' (abbreviation).
'in' is an insertion indicator.
'outskirts of' suggests removing the centre.
'cracow' with its middle taken out is 'cw'.
'ash'+'co'='ashco'
'ashco' placed into 'cw' is 'CASH COW'.
(Other definitions for cash cow that I've seen before include "producing high market share" , "source of profit" , "Money-maker" , "Money-spinning business" , "Lucrative activity" .)