Laurel placed on top of Bob’s carriage (8)
I believe the answer is:
stanhope
'carriage' is the definition.
(I know that stanhope is a type of carriage)
'laurel placed on top of bob's' is the wordplay.
'laurel' becomes 'stan' (I've seen this in another clue).
'placed on top of bob's' becomes 'hope' (I can't justify this - if you can you should give a lot more credence to this answer).
'stan'+'hope'='STANHOPE'
Can you help me to learn more?
(Other definitions for stanhope that I've seen before include "old-fashioned conveyance" , "carriage that has seat only for one" , "vehicle" , "It may have only two wheels" , "Light horse-drawn carriage; Nineteen across (anag.)" .)