Salesman sat out meal (6)
I believe the answer is:
repast
'meal' is the definition.
('repast' can be a synonym of 'meal')
'salesman sat out' is the wordplay.
'salesman' becomes 'rep' (I've seen this before).
'out' is an anagram indicator (out can mean wrong or inaccurate).
'sat' anagrammed gives 'ast'.
'rep'+'ast'='REPAST'
(Other definitions for repast that I've seen before include "Prates about meal" , "Food - tapers (anag)" , "Something to eat" , "Banquet" , "A formal sort of meal" .)