£1 for the last of 26 Italian pastries (7)

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

Changing the last letter of CANT (26ac) for LI (£1) gives CANLI. So to get to CANNOLI (the tasty Sicilian speciality) we presumably have to take the first of 26ac’s twin definitions (CAN’T) and expand it to CANNOT. I don’t feel this is an entirely fair strategy, but do please set me straight if you disagree…