Hard stuff broken in Tangier (7)

I believe the answer is:

granite

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

'hard' is the definition.
(granite can mean as hard as granite)

'stuff broken in tangier' is the wordplay.
'tangier' can be anagrammed to 'GRANITE'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for granite that I've seen before include "A very hard rock from Tangier" , "Constituent in Dartmoor" , "Showing great resolution" , "Crystalline rock" , "determination" .)

I've seen this clue in The Sun.

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