Give out what used to be due for revision (5)

I believe the answer is:

exude

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

'what used to be due for revision' is the wordplay.
'what used to be' becomes 'ex' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'for revision' indicates an anagram (I've seen this in other clues).
'due' anagrammed gives 'ude'.
'ex'+'ude'='EXUDE'

Can you help me to learn more?

(Other definitions for exude that I've seen before include "Seep" , "Discharge (eg, moisture)" , "Slowly give out (smell)" , "Discharge (fluid/smell) slowly" , "Give off, odour or sweat" .)

I've seen this clue in The Globe and Mail.

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