Liner after refit carrying old oil (6)
I believe the answer is:
neroli
'oil' is the definition.
(I know that Neroli is a oil)
'liner after refit carrying old' is the wordplay.
'after refit' indicates an anagram (letters refurbished or refitted).
'carrying' indicates putting letters inside.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'liner' anagrammed gives 'nerli'.
'nerli' placed around 'o' is 'NEROLI'.
(Other definitions for neroli that I've seen before include "Nil ore (anag.)" , "Product of orange-blossom" , "sort of oil" , "Orange flower oil" .)