Specific rail-car put out (10)
I believe the answer is:
particular
'specific' is the definition.
('particular' can be similar in meaning to 'specific')
'rail-car put out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'rail'+'car'+'put'='railcarput'
'railcarput' anagrammed gives 'PARTICULAR'.
(Other definitions for particular that I've seen before include "going into detail" , "Fastidious; individual" , "Special" , "Nice" , "Respect" .)