Laughable claim thrown out by company (7)
I believe the answer is:
comical
'laughable' is the definition.
('comical' can be a synonym of 'laughable')
'claim thrown out by company' is the wordplay.
'thrown out' indicates an anagram.
'by' is a charade indicator (letters next to each other).
'company' becomes 'co' (abbreviation).
'claim' is an anagram of 'mical'.
'mical' after 'co' is 'COMICAL'.
(Other definitions for comical that I've seen before include "Causing laughter" , "Rich" , "'Amusing, funny (7)'" , "Humorous" , "Witty" .)