Crossword Genius

A singular line in transport (8)

Ross

I believe the answer is:

monorail

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'transport' is the definition.
(I've seen this before)

'a singular line' is the wordplay.
'a singular' becomes 'mono' (I can't explain this - if you can you should believe this answer much more).
'line' becomes 'rail' (synonyms).
'mono'+'rail'='MONORAIL'

'in' is the link.

Can you help me to learn more?

(Other definitions for monorail that I've seen before include "Form of transport" , "train" , "Suspended railway" , "Hanging transport system" , "Type of railway" .)

I've seen this clue in the Evening Standard.
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