Faith is tied up on the telephone? (5)

I believe the answer is:

trust

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'faith' is the definition.
('trust' can be a synonym of 'faith')

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

(Other definitions for trust that I've seen before include "Faith; care" , "Have faith in, regard as reliable" , "Firm belief (in another)" , "Fidelity" , "Firm belief (in person)" .)

I've seen this clue in The Independent.

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