License for a pound down (5)
I believe the answer is:
allow
'license' is the definition.
(I've seen this in another clue)
'a pound down' is the wordplay.
'pound' becomes 'L' (the pound sign is based on an L).
'down' becomes 'low' (similar in meaning).
'a'+'l'+'low'='ALLOW'
'for' is the link.
(Other definitions for allow that I've seen before include "Sanction" , "Permit or acknowledge" , "Permit or concede" , "Permit or agree" , "Permit, consent to" .)