8 Down, Refusal to involve the writer having time to wit (6) ?A?E?Y
18 Down, Identical imp on board a couple of merchantmen? (8)
S?L?S?M?
21 Down, Wary about raising my touch in comfort (8) S?M?A?H?
24 Down, Old lady pinches one with nut crackers in Italian city (6)
M?N?U?
Compiler - PHI
Many Thanks