Drop tome off that’s being plugged (8)
I believe the answer is:
'being plugged' is the definition.
I can't judge whether this defines the answer.
'drop tome off' is the wordplay.
'off' indicates an anagram.
'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" .)