Crossword Genius

It's a safe bet their guns will be out of order (4,5)

Ross

I believe the answer is:

sure thing

I'm a little stuck... Click here to teach me more about this clue!

'it's a safe bet' is the definition.
(I've seen this in another clue)

'their guns will be out of order' is the wordplay.
'their guns' can be anagrammed to 'SURE THING'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for sure thing that I've seen before include "A certainty - I agree!" , "of course" , "no chance of losing" , "cert" .)

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