Crossword Genius

Given material backing? (5)

Ross

I believe the answer is:

lined

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

'given material backing?' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

'given material' is the wordplay.
I cannot really see how this works, but
'material' could be 'line' (line is a kind of material) and 'line' is located in the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for lined that I've seen before include "Covered inside" , "Put in a row" , "What ruler did" , "Covered inner surface" , "displaying signs of age" .)

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