Is there such a verb? again according to Chambers , subfusc appears to be either a noun or an adjective.
But we don't kn w that it or some version of it is the answer anyway, as the poster hasn't come back to us yet with the answer he's says he's found..
1A Strophiole's sofy now. APRIL?
1D Over here misplaced? (6) ACROSS?
3D With little to do. (8) LEISURED
18A Repetition in speech 5 (4) [clue 5 answer is USED] ECHO
9A Evil blast ? (5) CURSE