Crossword Genius

Having been given material backing? (5)

Ross

I believe the answer is:

lined

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'having been given material backing?' is the definition.
I can't judge whether this defines the answer.

'been given material backing?' is the wordplay.
'been' becomes 'led' (leading is a kind of being).
'given' means one lot of letters goes inside another.
'material backing?' becomes 'in' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'led' enclosing 'in' is 'LINED'.

Can you help me to learn more?

(Other definitions for lined that I've seen before include "Covered inside" , "What ruler did" , "pockets may be so filled?" , "Given an inner covering" , "Wrinkled or with layer of material on inside" .)

I've seen this clue in The Irish News.
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