Pound or pint (4)
I believe the answer is:
unit
'pound or pint' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for unit that I've seen before include "Group that's part of a larger organisation" , "detachment maybe" , "Single thing or person" , "Individual thing; one" , "Quantity chosen as standard, or individual thing" .)