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It hasn't provided protective headgear (3-4)

Ross

I believe the answer is:

tin-hats

I'm a little stuck... Click here to teach me more about this clue!

'protective headgear' is the definition.
Although both the answer and 'headgear' are nouns, they are not in the same form of the noun.

'it hasn't provided' is the wordplay.
'provided' is an anagram indicator (I've seen 'provide' mean this).
'it'+'hasnt'='ithasnt'
'ithasnt' anagrammed gives 'TIN-HATS'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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