Dry river bed finally made safe (7)

I believe the answer is:

secured

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'safe' is the definition.
(I've seen this in another clue)

'dry river bed finally' is the wordplay.
'dry' becomes 'sec' (similar in meaning).
'river' becomes 'ure' (river in Yorkshire).
'bed finally' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'sec'+'ure'+'d'='SECURED'

'made' acts as a link.

Can you help me to learn more?

(Other definitions for secured that I've seen before include "Gained" , "Got by special effort" , "Tethered" , "Seized" , "Rescued (anag.)" .)

I've seen this clue in The Daily Express.

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