Kenneth, he really every so often displays charm (7)
I believe the answer is:
enthral
'charm' is the definition.
(enthral can mean to charm or captivate)
'kenneth he really every so often' is the wordplay.
'every so often' indicates alternate letters.
'kenneth'+'he'+'really'='kennethhereally'
The alternate letters of 'kennethhereally' are 'ENTHRAL'.
'displays' is the link.
(Other definitions for enthral that I've seen before include "Entrance" , "Bewitch" , "be captivating?" , "Totally fascinate" , "Hold spellbound" .)