Finale of Platters hit – The Great Pretender? (7)

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

A charade of S (‘finale of Platter S ‘) plus HAMMER (‘hit’). Your choice whether ‘the great’ goes with ‘hit’ or the definition. Either way, “The Great Pretender” was a song by the Platters.