Crossword Genius

Old runner backward about money but a quick learner? (7)

Ross

I believe the answer is:

crammer

'a quick learner?' is the definition.
(someone who crams knowledge in)

'old runner backward about money' is the wordplay.
'old runner' becomes 'Cram' (retired British runner Steve Cram).
'backward' is a reversal indicator.
'about' becomes 're' (regarding).
'money' becomes 'm' (abbreviation used in economics).
're'+'m'='rem'
'rem' backwards is 'mer'.
'cram'+'mer'='CRAMMER'

'but' is the link.

(Another definition for crammer that I've seen is " Tutor specifically for exam".)

I've seen this clue in The Guardian.
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