Cat lies injured; stretcher required (7)

I believe the answer is:

elastic

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

'stretcher required' is the definition.
I can't judge whether this defines the answer.

'cat lies injured' is the wordplay.
'injured' indicates anagramming the letters.
'cat'+'lies'='catlies'
'catlies' with letters rearranged gives 'ELASTIC'.

Can you help me to learn more?

(Other definitions for elastic that I've seen before include "Variable" , "Stretcher" , "Springing back to shape after stretching" , "Cats lie (anag.)" , "Flexible, adaptable" .)

I've seen this clue in The Globe and Mail.

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