Thanks court in charge of scheme (6)
I believe the answer is:
tactic
'scheme' is the definition.
(thesaurus)
'thanks court in charge' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'court' becomes 'ct'.
'in charge' becomes 'ic' (abbreviation for 'in charge').
'ta'+'ct'+'ic'='TACTIC'
'of' acts as a link.
(Other definitions for tactic that I've seen before include "Stratagem, procedure" , "Manoeuvre, stratagem" , "Action designed to achieve a specific end" , "Manoeuvre designed to outwit enemy" , "Action/strategy to achieve a specific end" .)