Protective helmet (7)

I think it could be either:

Which length description are you looking for?:

4,3

hard hat

'protective helmet' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for hard hat that I've seen before include "Protective headgear" , "Builder's safety wear" , "'nutcase'" , "Headgear for building sites, etc" , "Derby, perhaps" .)

I've seen this clue in The Sun.

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