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One given to singing about criminal business? (2,2)

Ross

I believe the answer is:

at it

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'criminal business?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'one given to singing' is the wordplay.
'one' becomes 'a'.
'given to' means one lot of letters go next to another.
'singing' becomes 'tit' (I can't explain this - if you can you should believe this answer much more).
'a'+'tit'='AT IT'

'about' is the link.

Can you help me to learn more?

(Other definitions for at it that I've seen before include "working hard" , "Engaged in something particular" , "Active" , "engaged in crime?" , "Up to no good" .)

I've seen this clue in The Telegraph.
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