Emit, as a loud cry, when allowed free (3,3)
I believe the answer is:
let out
'emit' is the definition.
(I know that emit can be written as let out)
'allowed free' is the wordplay.
'allowed' becomes 'let' (to let is to allow or permit).
'free' becomes 'out' (I've seen this before).
'let'+'out'='LET-OUT'
'as a loud cry when' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for let out that I've seen before include "Way of escape" , "Discharge from prison or enlarge garment" , "released from prison" , "An opportunity to escape from a fix" , "Release or make garment looser" .)