Horse-drawn carriage, second phaeton, abandoned (8)
I believe the answer is:
stanhope
'horse-drawn carriage' is the definition.
(I've seen this before)
'second phaeton abandoned' is the wordplay.
'second' becomes 's' (common abbreviation**).
'abandoned' indicates anagramming the letters.
'phaeton' anagrammed gives 'tanhope'.
's'+'tanhope'='STANHOPE'
(Other definitions for stanhope that I've seen before include "old-fashioned conveyance" , "carriage that has seat only for one" , "Light horse-drawn carriage; Nineteen across (anag.)" , "vehicle" , "Phaetons can be turned into a light open one-seater carriage" .)