Note house on British river tempted woman (9)
I believe the answer is:
semibreve
'british river tempted woman' is the definition.
I can't tell whether this defines the answer.
'note house on' is the wordplay.
'note' becomes 'breve' (musical note).
'house' becomes 'semi' (short for semi-detached).
'on' is a charade indicator (letters next to each other).
'breve' after 'semi' is 'SEMIBREVE'.
Can you help me to learn more?
(Other definitions for semibreve that I've seen before include "Note equal to two minims" , "Note equivalent to four crotchets" , "2 minims/4 crotchets" .)