International Bale wickedly skilful (7)
I believe the answer is:
capable
'skilful' is the definition.
(thesaurus)
'international bale wickedly' is the wordplay.
'international' becomes 'cap' (sportsperson who competes internationally).
'wickedly' is an anagram indicator.
'bale' anagrammed gives 'able'.
'cap'+'able'='CAPABLE'
(Other definitions for capable that I've seen before include "'Clever, able (7)'" , "qualified" , "Competent, having a certain ability" , "accomplished" , "Able, competent" .)