Genteel manoeuvring ideally to bag king (8)
I believe the answer is:
ladylike
'genteel' is the definition.
(I've seen this before)
'manoeuvring ideally to bag king' is the wordplay.
'manoeuvring' is an anagram indicator.
'to bag' indicates putting letters inside.
'king' becomes 'K' (abbreviation for king in chess).
'ideally' is an anagram of 'ladylie'.
'ladylie' enclosing 'k' is 'LADYLIKE'.
(Other definitions for ladylike that I've seen before include "Genteel (not referring to gents)" , "Appropriate to a well-mannered woman" , "Typical of a well-mannered woman" , "Of a woman, refined and genteel" , "Graciously feminine" .)