Crossword Genius

Have great confidence in (5,2)

Ross

I believe the answer is:

swear by

'have great confidence in' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for swear by that I've seen before include "Express great confidence in" , "Rely on" , "Have utter faith in" , "Have total faith in" .)

I've seen this clue in The Independent.
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