Main tale delivered in durable cover (8)

I believe the answer is:

laminate

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

'cover' is the definition.
(laminating is a kind of covering)

'main tale delivered in durable' is the wordplay.
'main tale' can be anagrammed to 'LAMINATE'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for laminate that I've seen before include "Split into layers; cover with protective material" , "Anti-male (anag.)" , "Manufacture by layering" , "Form in thin sheets" , "Thinly cover" .)

I've seen this clue in The Mirror.

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