They advertise tracks cut by Queen (8)
I believe the answer is:
trailers
'they advertise' is the definition.
The definition suggests an adverb but the answer is not.
'tracks cut by queen' is the wordplay.
'tracks' becomes 'trails' (trail is a kind of track).
'cut' means to remove the last letter.
'by queen' becomes 'ers' (I can't explain this - if you can you should give a lot more credence to this answer).
'trails' with its final letter taken away is 'trail'.
'trail'+'ers'='TRAILERS'
Can you help me to learn more?
(Other definitions for trailers that I've seen before include "Vehicles designed to be towed behind others" , "Means of transport" , "Ads in cinema" , "concise, abbreviated advertising" , "Short scenes to advertise films" .)