Corny cover for the head? (8)

I believe the answer is:

strawhat

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'head?' is the definition.
Both the answer and definition are adjectives.
Perhaps you can see a link between them that I can't see?

'corny cover' is the wordplay.
'corny' becomes 'straw' (I can't justify this - if you can you should believe this answer much more).
'cover' becomes 'hat' (cover for one's head).
'straw'+'hat'='STRAWHAT'

'for the' is the link.

Can you help me to learn more?

(Other definitions for strawhat that I've seen before include "E.g. boater" , "Headgear for the sun" , "Summer headgear" .)

I've seen this clue in The Irish Independent.

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