Penny or farthing, eg (4)
I believe the answer is:
coin
This clue is a double definition.
'penny' is the first definition.
(I've seen this in another clue)
'farthing eg' is the second definition.
(farthing is a kind of coin)
(Other definitions for coin that I've seen before include "Fabricate" , "little money" , "Invent (a new phrase)" , "American quarter, for example" , "Mint" .)