Spot that woman's instruments (7)
I believe the answer is:
zithers
'instruments' is the definition.
(zither is a kind of instrument)
'spot that woman's' is the wordplay.
'spot' becomes 'zit'.
'that woman's' becomes 'hers' (I've seen this before).
'zit'+'hers'='ZITHERS'
(Other definitions for zithers that I've seen before include "Note producers" , "Stringed instruments played while laid flat" , "Stringed instruments plucked when lying flat" , "Musical instruments" .)