Head is red so occasionally needs such attention (6)
I believe the answer is:
hairdo
'such attention' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'head is red so occasionally' is the wordplay.
'occasionally' indicates alternate letters (letters taken at regular intervals or occasions).
'head'+'is'+'red'+'so'='headisredso'
The alternate letters of 'headisredso' are 'HAIRDO'.
'needs' is the link.
Can you help me to learn more?
(Other definitions for hairdo that I've seen before include "capital arrangement" , "Style for one's crowning glory" , "Barnet" , "Styling of the locks" , "Cut and set" .)