Our Templar, a supplier of protective steel (6,5)

I believe the answer is:

armour plate

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

'protective steel' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'our templar a supplier' is the wordplay.
'our templar a' anagrams to 'ARMOUR PLATE'.
But, I am unsure how this is indicated.

'of' is the link.

Can you help me to learn more?

(Another definition for armour plate that I've seen is " Military protection".)

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

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