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Spy doing tweets to his boss? (7,3)

Ross

I believe the answer is:

peeping tom

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

'spy' is the definition.
(I've seen this before)

'doing tweets to his boss?' is the wordplay.
I cannot quite see how this works, but
'to' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for peeping tom that I've seen before include "Voyeur" , "who likes looking at females" , "Spy" , "One who spies pruriently on others" .)

I've seen this clue in The Times and The Independent.
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