Network Rail supporter , elevated to the Lords possibly without notice (7)
I believe the answer is:
roadbed
'network rail supporter' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'elevated to the lords possibly without notice' is the wordplay.
'elevated' says the letters should be written backwards (in a down clue, letters go up).
'to the lords possibly' becomes 'debor' (I can't explain this - if you can you should give a lot more credence to this answer).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'notice' becomes 'ad' (both can mean an advertisement).
'debor' written backwards gives 'robed'.
'robed' enclosing 'ad' is 'ROADBED'.
Can you help me to learn more?
(Other definitions for roadbed that I've seen before include "ballast" , "support to sleepers" , "Preliminary work on track" .)