Love London-based bank that produces notes (4)
I believe the answer is:
oboe
'bank that produces notes' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'love london-based' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'london-based' becomes 'boe' (I can't explain this - if you can you should believe this answer much more).
'o'+'boe'='OBOE'
Can you help me to learn more?
(Other definitions for oboe that I've seen before include "Source of music" , "blow it!" , "Orchestral piece" , "Double-reed woodwind" , "Instrument used in 1d" .)