IT professional? (3,6)

I believe the answer is:

sex worker

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'it professional?' is the definition.
The definition suggests a singular noun which matches the answer.

'it professional?' is the wordplay.
'it' becomes 'sex' ('it' is a common euphemism for sex).
'professional?' becomes 'worker' (I can't explain this - if you can you should give a lot more credence to this answer).
'sex'+'worker'='SEX WORKER'

Can you help me to learn more?

I've seen this clue in The Guardian.

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