Quickly learns about sheep (5)

I believe the answer is:

crams

'quickly learns' is the definition.
(as in cramming before an exam)

'about sheep' is the wordplay.
'about' becomes 'c' (abbreviation for 'circa').
'sheep' becomes 'rams' (male sheep).
'c'+'rams'='CRAMS'

I've seen this clue in The Guardian.

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