27 Across, Underwear we've worn out in former 23'sview (1,5,3,)
(23 = 4 Character writer's back at St Andrews (7) 4 Answer = TEMPEST)
1 Down, Cover instruments in US: One fiddly bit's loose (8,4)F?????T? ????)
17 Across, 4 character sat in bow with a novel (9) ??????P??