Turn, as let off as a consequence (9)
I believe the answer is:
resultant
'a consequence' is the definition.
(thesaurus)
'turn as let off' is the wordplay.
'off' indicates anagramming the letters.
'turn'+'as'+'let'='turnaslet'
'turnaslet' with letters rearranged gives 'RESULTANT'.
'as' is the link.
(Other definitions for resultant that I've seen before include "Ensuing, consequent" , "force" .)