Accountant left one company cotton cloth (6)
I believe the answer is:
calico
'cotton cloth' is the definition.
(I've seen this before)
'accountant left one company' is the wordplay.
'accountant' becomes 'ca' (abbreviation for chartered accountant).
'left one' becomes 'li' (left abbreviation plus 1).
'company' becomes 'co' (abbreviation).
'ca'+'li'+'co'='CALICO'
(Other definitions for calico that I've seen before include "Type of cotton cloth" , "Given material for dress" , "Unbleached sixteen down cloth" , "Plain cotton cloth, white or unbleached" , "White cotton fabric" .)