No stamp needed to liberate a pole (8)
I believe the answer is:
freepost
'no stamp needed' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'liberate a pole' is the wordplay.
'liberate' becomes 'free' (synonyms).
'a pole' becomes 'post' (post can mean a pole or stake).
'free'+'post'='FREEPOST'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for freepost that I've seen before include "No stamp needed here" , "mail service" .)