Head is red, so occasionally needs such styling (6)
I believe the answer is:
hairdo
'needs such styling' is the definition.
(a hairdo is a hairstyle)
'head is red so occasionally' is the wordplay.
'occasionally' indicates alternate letters.
'head'+'is'+'red'+'so'='headisredso'
The alternating letters of 'headisredso' are 'HAIRDO'.
(Other definitions for hairdo that I've seen before include "Style for one's crowning glory" , "Arrangement of locks" , "Eg, beehive or mullet" , "Bob, perm or bouffant" , "Say, crew cut" .)