Say you didn’t mean it, when you regain possession (4,4)

I believe the answer is:

take back

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'regain possession' is the definition.
'take back' can be an answer for 'regain' (thesaurus). I am not sure about the 'possession' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for take back that I've seen before include "Retract statement or return goods" , "revoke" , "Recapture" .)

I've seen this clue in the Evening Standard.

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