Crossword Genius

Former head, a classy chap (3,4)

Ross

I believe the answer is:

old bean

I'm a little stuck... Click here to teach me more about this clue!

'a classy chap' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'former head' is the wordplay.
'former' becomes 'old' (I've seen this before).
'head' becomes 'bean' (bean is a kind of head).
'old'+'bean'='OLD BEAN'

Can you help me to learn more?

(Other definitions for old bean that I've seen before include "Good friend" , "My dear chap!" , "Dated familiar term of address to a man" , "Familiar address to chap" , "Familiar way to address" .)

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