Crossword Genius

Bound to believe what one hears? (7)

Ross

I believe the answer is:

trussed

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'bound' is the definition.
('truss' can be a synonym of 'bind')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for trussed that I've seen before include "Secured" , "Tied up" , "Bundled up" , "Dusters (anag) - bound" , "with restrictions on members" .)

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