He is acquiring university colours (4)

I believe the answer is:

hues

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'colours' is the definition.
(I know this)

'he is acquiring university' is the wordplay.
'he' becomes 'hes' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'is acquiring' indicates putting letters inside.
'university' becomes 'u' (abbreviation for university).
'hes' going around 'u' is 'HUES'.

Can you help me to learn more?

(Other definitions for hues that I've seen before include "Colours" , "Tones or shades" .)

I've seen this clue in The Mirror.

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