Complete collection of books set aside (5)

I believe the answer is:

allot

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'set aside' is the definition.
(I've seen this in another clue)

'complete collection of books' is the wordplay.
'complete' becomes 'all' (similar in meaning).
'collection of books' becomes 'ot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'all'+'ot'='ALLOT'

Can you help me to learn more?

(Other definitions for allot that I've seen before include "Apportion (something to someone)" , "Award (share, task)" , "Assign a share" , "Give, apportion" , "Hand out" .)

I've seen this clue in The Times.

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