A form of cloth-headed nincompoop? (5)
I believe the answer is:
class
'a form' is the definition.
(synonyms)
'cloth-headed nincompoop?' is the wordplay.
'cloth-headed' becomes 'cl' (I can't explain this - if you can you should believe this answer much more).
'nincompoop?' becomes 'ass' (I've seen this before).
'cl'+'ass'='CLASS'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for class that I've seen before include "Form; stylishness" , "Standing" , "26 [ORDER]" , "sort" , "Opportunity to learn" .)