Possible Clues:

• Well up in class system
• Wise
• Learnt to have money in the Dee back there
• There's some old money in the river up there, so one is taught
• Learned English in unfashionable University College
• Trained cadet due to pass out
• How to be taught that there's money in the river back there
• Taught English money by journalist
• How one has got to know there's money in the Dee (8)
• In the Dee back there one has learned there is money in it