There’s copper, nominally, to be found around Penzance! (5)
I believe the answer is:
pence
'there's copper nominally to be found around penzance' is the definition.
I can't judge whether this defines the answer.
'there's copper nominally to be found around' is the wordplay.
'there's' says to put letters next to each other.
'copper' becomes 'p'.
'nominally' becomes 'enc' (I can't explain this - if you can you should give a lot more credence to this answer).
'to be found' becomes 'met' (synonym).
'around' means to look at the middle letters.
The middle of 'met' is 'e'.
'p' next to 'enc' is 'penc'.
'penc'+'e'='PENCE'
Can you help me to learn more?
(Other definitions for pence that I've seen before include "Small quantity of money" , "offering to St Peter" , "some European capital" , "''Take care of the ..... and the pounds will take care of themselves''" , "Small change" .)