Support for track of Pullman carriage (7)
I believe the answer is:
sleeper
This clue is a quadruple definition!!
'support' is the first definition.
(sleeper is a kind of support)
'for' is a link.
'track' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'of' acts as a link.
'pullman' is the third definition.
(I've seen this in another clue)
'carriage' is the fourth definition.
(I know that sleeper is a type of carriage)
Can you help me to learn more?
(Other definitions for sleeper that I've seen before include "found on the railway" , "Long-inactive secret agent" , "Brace to support rail on track" , "Unactivated spy - railway support" , "Rip Van Winkle" .)