Pop back to secure (3)

I believe the answer is:

'secure' is the definition.
(pinning is a kind of securing)

'pop back' is the wordplay.
'pop' becomes 'nip' ('nip out' and 'pop out' can both mean to go out).
'back' shows that the letters should be reversed in order.
'nip' written backwards gives 'PIN'.

'to' acts as a link.

(Other definitions for pin that I've seen before include "Needle" , "Tack; fasten" , "Badge" , "Skittle; chess attack" , "Hold (down)" .)

I've seen this clue in the Evening Standard.

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