Crossword Genius

What holds the saddle on a certainty? (3,1,5)

Ross

I believe the answer is:

its a cinch

I believe this clue is a double definition.

'what holds the saddle' is the first definition.
(I've seen this before)

'a certainty?' is the second definition.
(I've seen this before)

'on' is the link.

(Other definitions for its a cinch that I've seen before include "What holds the saddle" , "certainty?" .)

I've seen this clue in The Globe and Mail.
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