Crossword Genius

Captain replaces bandleader converting wine container to a library desk (6)

Ross

I believe the answer is:

carrel

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

'captain replaces bandleader converting wine' is the definition.
I can't tell whether this definition defines the answer.

'container to a library desk' is the wordplay.
'container' becomes 'car' (car is a kind of container).
'to a library desk' becomes 'rel' (I can't justify this - if you can you should give a lot more credence to this answer).
'car'+'rel'='CARREL'

Can you help me to learn more?

(Another definition for carrel that I've seen is " Small individual study area in a library".)

I've seen this clue in the Sydney Morning Herald.
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