Crossword Genius

It is likely to succeed — rush, get in lively! (4,5)

Ross

I believe the answer is:

sure thing

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'it is likely to succeed' is the definition.
(something certain to do well)

'rush get in lively' is the wordplay.
'rush get in' anagrams to 'SURE THING'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

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

I've seen this clue in The Times.
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