Orange books in lift (7)

I believe the answer is:

carroty

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'orange' is the definition.
(carroty is a kind of orange)

'books in lift' is the wordplay.
'books' becomes 'OT' (Old Testament).
'in' means one lot of letters goes inside another.
'lift' becomes 'carry' (I can't justify this - if you can you should give a lot more credence to this answer).
'ot' inserted inside 'carry' is 'CARROTY'.

Can you help me to learn more?

(Another definition for carroty that I've seen is " with red hair?".)

I've seen this clue in The Guardian.

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