Crossword Genius

Sure to be tied up (5)

Ross

I believe the answer is:

bound

This clue is a double definition.

'sure' is the first definition.
(synonyms)

'be tied up' is the second definition.
(I've seen this in another clue)

'to' acts as a link.

(Other definitions for bound that I've seen before include "Destined" , "Bob < sure < to be heading for" , "Jump - certain - limit" , "Place restrictions" , "Confined" .)

I've seen this clue in the Evening Standard.
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