Brussels, say, putting money into small arts organisation — quite the opposite (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

‘Quite the opposite’ indicates that the inner and outer elements of the envelope are switched. An envelope (‘putting … into’) of S (‘small’) plus ICA (‘Institute of Contemporary Arts’, such as the one in London) in BRASS (‘money’). ‘Brussels’ are brussels sprouts.