Soccer group’s discretion upset rich businessman? (3,3)
I believe the answer is:
fat cat
'rich businessman?' is the definition.
'soccer group's discretion upset' is the wordplay.
'soccer group' becomes 'fa' (the FA, the Football Association).
'discretion' becomes 'tact' (I've seen this before).
'upset' is a reversal indicator.
'tact' reversed gives 'tcat'.
'fa'+'tcat'='FAT CAT'
(Other definitions for fat cat that I've seen before include "Wealthy and privileged person" , "Rich person or obese feline" , "Wealthy person like obese feline" , "Big cheese" , "Wealthy and powerful person (informal)" .)