Kind manner, one not evident in blokes (9)
I believe the answer is:
gentlemen
'blokes' is the definition.
(blokes can informally mean men)
'kind manner one not' is the wordplay.
'kind' becomes 'gentle' (I've seen this in another clue).
'manner' becomes 'mien' (mien can mean a manner or attitude).
'one' becomes 'i' (Roman numeral).
'not' is a deletion indicator.
'mien' with 'i' taken out is 'men'.
'gentle'+'men'='GENTLEMEN'
'evident in' acts as a link.
(Other definitions for gentlemen that I've seen before include "Males of good standing" , "'Time ____ 15!'" , "with a preference for the flaxen-haired?" , "fellows held to be considerate?" , "of high social standing?" .)