Coach may see risk cut straddling horse (9)
I believe the answer is:
Here is my best explanation:
'horse' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'coach may see risk cut straddling' is the subsidiary indication.
'coach may' becomes 'arab' (I can't explain this - if you can you should believe this answer much more).
'see risk' becomes 'chance' (chance is a kind of risk).
'cut' means to remove the last letter.
'straddling' means one lot of letters goes inside another (straddle can mean to lie on both sides of).
'chance' with its final letter taken off is 'chanc'.
'arab' put inside 'chanc' is 'charabanc'.
(Other definitions for charabanc that I've seen before include "Old vehicle", "Old tourist coach", "Early coach", "Former coach", "Bus", "Early bus", "Coach", "Tourist coach", "old vehicle" and "E.g. transport".)