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15a Con keeping tabs on parliament's leader for David Cameron, say (4,4), and 18a Musical work closed with finale from tenor, which may be a plus (8), The answers look like Life Peer, and Operator but I can't parse them?

A con(vict) is a LIFER, surrounding the letter PEE (parliament’s leader)

OPERA (musical work) + TO (closed, as in a door, pull the door to) + R (finale of tenor). An operator is a mathematical symbol, hence plus

Thanks quisling. I hadn't thought of pee as the spelling of P!