Free lease not included (3,3)

I believe the answer is:

let out

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'free' is the definition.
(synonyms)

'lease not included' is the wordplay.
'lease' becomes 'let' (synonyms).
'not included' becomes 'out' (I can't justify this - if you can you should give a lot more credence to this answer).
'let'+'out'='LET-OUT'

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(Other definitions for let out that I've seen before include "available for rent?" , "Release from custody or enlarge garment" , "released from prison" , "Release or blab secret" , "Leak" .)

I've seen this clue in The Globe and Mail.

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