Artist laid back about copyright is ultimately sure to become more controversial (10)

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

A charade of RA (‘artist’) plus DICAL, an envelope (‘about’) of C (‘copyright’) in DIAL, a reversal (‘back’) of ‘laid’; plus ‘is’ plus E (‘ultimately sur E ‘). The answer may mean make or become more radical.