Occasionally view Naoimh displaying spite (5)
I believe the answer is:
venom
'spite' is the definition.
(I know that spite can be written as venom)
'occasionally view naoimh' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'view'+'naoimh'='viewnaoimh'
The alternating letters of 'viewnaoimh' are 'VENOM'.
'displaying' is the link.
(Other definitions for venom that I've seen before include "ill will" , "Poisonous liquid of snakes" , "Snake poison" , "Bitter malice" , "bitterness" .)