Tracks from Queen forever entertaining yours truly (8)
I believe the answer is:
railways
'tracks' is the definition.
(I know this)
'queen forever entertaining yours truly' is the wordplay.
'queen' becomes 'r' (abbreviation for regina, e.g. in ER ).
'forever' becomes 'always' (I've seen this before).
'entertaining' is an insertion indicator (inviting in, as for dinner).
'yours truly' becomes 'I' (the person who set this crossword).
'always' going around 'i' is 'ailways'.
'r'+'ailways'='RAILWAYS'
'from' acts as a link.
(Other definitions for railways that I've seen before include "Sets of train tracks" , "Permanent ways" , "Iron roads" , "Means of transport" , "Systems of transportation" .)