Narcissus may doff a cocked up hat (8)
I believe the answer is:
daffodil
'narcissus' is the definition.
(I know that narcissus can be written as daffodil)
'doff a cocked up hat' is the wordplay.
'cocked up' indicates an anagram (I've seen this in other clues).
'hat' becomes 'dil' (I am not sure about this - if you are sure you should believe this answer much more).
'doff'+'a'='doffa'
'doffa' anagrammed gives 'daffo'.
'daffo'+'dil'='DAFFODIL'
'may' acts as a link.
Can you help me to learn more?
(Other definitions for daffodil that I've seen before include "Yellow-flowered narcissus" , ""Welsh" flower?" , "Yellow bloom" , "Yellow flower with trumpet-shaped centre" , "Flower from bulb" .)