Budget everything ahead of overtime (5)

I believe the answer is:

allot

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'budget' is the definition.
(I've seen this before)

'everything ahead of overtime' is the wordplay.
'everything' becomes 'all' (all things).
'ahead of overtime' 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 "Award (share, task)" , "budget" , "Ration" , "split up" , "Distribute in portions" .)

I've seen this clue in The Hindu.

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