Lets hem out which should provide some protection (7)

I believe the answer is:

helmets

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'should provide some protection' is the definition.
I can't tell whether this defines the answer.

'lets hem out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'lets'+'hem'='letshem'
'letshem' is an anagram of 'HELMETS'.

'which' acts as a link.

Can you help me to learn more?

(Other definitions for helmets that I've seen before include "Protective head plates" , "Protective head coverings" , "Protective head-gear" .)

I've seen this clue in The Irish Times.

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