Stylish form, your head (6)
I believe the answer is:
classy
'stylish' is the definition.
(similar in meaning)
'form your head' is the wordplay.
I cannot quite understand how this works, but
'form' could be 'class' (synonyms) and 'class' is located in the answer.
A single letter 'y' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for classy that I've seen before include "Stylish (slang)" , "Sophisticated, stylish" , "showing style ..." , "Elegant and fashionable, posh" , "Informally stylish and superior" .)