Drop tome off that’s being plugged (8)

I believe the answer is:

promoted

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

'being plugged' is the definition.
I can't judge whether this defines the answer.

'drop tome off' is the wordplay.
'off' indicates an anagram.
'drop'+'tome'='droptome'
'droptome' anagrammed gives 'PROMOTED'.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for promoted that I've seen before include "Advanced" , "Publicised" , "Put up" , "Pushed" .)

I've seen this clue in The Mirror.

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