Freed/ let out again (8)
I believe the answer is:
released
'freed' is the definition.
('release' can be a synonym of 'free')
'let out again' is the wordplay.
'let out' becomes 'release' (synonyms).
'again' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'release'+'d'='RELEASED'
Can you help me to learn more?
(Other definitions for released that I've seen before include "Discharged" , "Liberated" , "Let out - let out again" , "free after imprisonment?" , "Set free" .)