Obstinate skilful Scot is included (7)
I believe the answer is:
defiant
'obstinate' is the definition.
(thesaurus)
'skilful scot is included' is the wordplay.
'skilful' becomes 'deft' (deft means skilful).
'scot' becomes 'ian' (Scottish given name).
'is included' indicates putting letters inside.
'deft' placed around 'ian' is 'DEFIANT'.
(Other definitions for defiant that I've seen before include "Openly resisting" , "challenging authority" , "Insubordinate" , "obstreperous" , "Mutinous" .)