I learned one's maybe bust (5)

I believe the answer is:

image

'maybe bust' is the definition.
(a bust is a sculpted image of someone)

'i learned one's' is the wordplay.
'learned one' becomes 'mage' (a wise or learned person).
'i'+'mage'='IMAGE'

(Other definitions for image that I've seen before include "Picture; simile" , "Likeness or mental picture" , "Likeness, could be spitting" , "of Kairos with Melchior?" , "Likeness, might be spitting" .)

I've seen this clue in The Guardian.

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