Bad behaviour sees dropping of first reserve (3)

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

I think this is [v] ICE (bad behaviour) dropping the first letter. Ice, as a verb = “put on ice” = reserve for later.  UPDATE: KVa @1 suggests ice, as a noun = reserve = a person’s unfriendly character, which I think is a better explanation.