Perverse fancy for a single note (8)
I believe the answer is:
crotchet
This might be a double definition.
'perverse fancy' is the first definition.
'crotchet' can be an answer for 'fancy' (I've seen this before). I'm not certain of the 'perverse' bit.
'a single note' is the second definition.
'crotchet' can be an answer for 'note' (crotchet is a kind of note). I am not sure about the 'a single' bit.
'for' is the link.
Can you help me to learn more?
(Other definitions for crotchet that I've seen before include "Fancy" , "as mark scored" , "Musical note equal to half a minim" , "Two quavers as one note" , "Quarter of a semibreve" .)