For lace, it's unusually stretchy (7)

I believe the answer is:

elastic

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'stretchy' is the definition.
(something elastic can be stretched)

'for lace it's unusually' is the wordplay.
'lace it's' anagrams to 'ELASTIC'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for elastic that I've seen before include "Giving" , "Flexible rubber strip" , "Something stretchy" , "Springing back to shape after stretching" , "Flexible rubbery strip" .)

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