Dull meat concoction (4)
I believe the answer is:
tame
'dull' is the definition.
(both can mean boring)
'meat concoction' is the wordplay.
'concoction' indicates an anagram.
'meat' is an anagram of 'TAME'.
(Other definitions for tame that I've seen before include "Subdue" , "far from spicy" , "quiet" , "Broken in" , "Domisticated with meat" .)