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Secure (6)

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6

4,4

'secure' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for fasten that I've seen before include "Affix" , "Close, make secure" , "Fix securely" , "Shut" , "Bolt" .)

I've seen this clue in The Guardian, The Sunday Times, the Evening Standard, The New York Times, The Mirror, the LA Times, The Times and the Sydney Morning Herald.
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