You can bet this has to do with a title! (5)

I believe the answer is:

wager

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'you can bet this has to do' is the definition.
The definition suggests a singular noun which matches the answer.

'with a title' is the wordplay.
'with' becomes 'w' (short for with).
'a title' becomes 'ager' (I can't explain this - if you can you should give a lot more credence to this answer).
'w'+'ager'='WAGER'

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(Other definitions for wager that I've seen before include "Punt" , "Risk; stake" , "stake required" , "A bet or stake" , "Bet, gamble" .)

I've seen this clue in the Evening Standard.

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