London coppers (5)
I believe the answer is:
pence
'london coppers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pence that I've seen before include "President's vice" , "Money used to be pounds, shillings and ....." , "''... fumble in a greasy till/and add the halfpence to the ...'' (Yeats)" , "Small quantity of money" , "Lowest denomination of British currency" .)