Pick scruffy lovelorn Rumpole to inspire court (8)
I believe the answer is:
plectrum
'pick' is the definition.
(a guitar pick)
'scruffy lovelorn rumpole to inspire court' is the wordplay.
I cannot quite see how this works, but
'court' could be 'ct' (abbreviation used in road names) and 'ct' is located in the answer.
This explanation may well be incorrect...
(Other definitions for plectrum that I've seen before include "Small piece of plastic for plucking musical strings" , "Guitar pick" , "Device for playing guitar" , "Device for plucking strings of an instrument" , "Guitar plucker" .)