Get away in approximate intermission first (5,5)

I believe the answer is:

break loose

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'get away' is the definition.
(synonyms)

'approximate intermission first' is the wordplay.
'approximate' becomes 'loose' (I can't justify this - if you can you should believe this answer much more).
'intermission' becomes 'break' (synonyms).
'first' means one lot of letters go next to another.
'loose' after 'break' is 'BREAK LOOSE'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for break loose that I've seen before include "Go and escape" , "Burst forth" .)

I've seen this clue in The Daily Express.

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