Comes by and fixes (7)

I believe the answer is:

secures

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'fixes' is the definition.
('secure' can be a synonym of 'fix')

I don't understand the rest of the clue.

(Other definitions for secures that I've seen before include "Ties down" , "Closes, fortifies" , "Makes safe through rescues" , "Guarantees" , "Makes firmly attached" .)

I've seen this clue in the Evening Standard.

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