Clean mince contained meat (13)
I believe the answer is:
decontaminate
'clean' is the definition.
(decontaminating is a kind of cleaning)
'mince contained meat' is the wordplay.
'mince' indicates an anagram.
'contained'+'meat'='containedmeat'
'containedmeat' anagrammed gives 'DECONTAMINATE'.
(Other definitions for decontaminate that I've seen before include "Remove dangerous substances from" , "Remove dangerous substance from (something)" , "Purify; make safe" , "Remove the bad" , "Remove pollution from" .)