Let out — and do so again? (7)

I believe the answer is:
release
'let out' is the definition.
(synonyms)
'do so again?' is the wordplay.
I cannot really understand how this works, but
'so' could be 'as' (eg 'not as tall as me' means 'not so tall as me') and 'as' is located in the answer.
'again?' could be 're' (prefix meaning 'again') and 're' is found within the answer.
The remaining letters 'lee' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for release that I've seen before include "Free from confinement" , "Issue" , "Free - delivery" , "Liberate" , "Set free - publish" .)
