Certain it will be bound to be complicated (9)

I believe the answer is:

intricate

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'be complicated' is the definition.
(I've seen this before)

'certain it will be bound' is the wordplay.
'certain it' can be anagrammed to 'INTRICATE'.
Though, I am not sure how the anagram is indicated.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for intricate that I've seen before include "Entangled" , "puzzling" , "Convoluted" , "Fancy" , "Complex, labyrinthine" .)

I've seen this clue in the Evening Standard.

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