King keeping English a source of wealth? Check again (2-7)

I believe the answer is:

re-examine

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'king keeping english a source of wealth? check again' is the definition.
I can't tell whether this definition defines the answer.

'king keeping english a source of wealth?' is the wordplay.
'king' becomes 'rex' ('king' in Latin).
'keeping' means one lot of letters goes inside another (some letters kept inside).
'english' becomes 'E' (abbreviation).
'source of wealth?' becomes 'mine' (I've seen this before).
'rex' placed around 'e' is 'reex'.
'reex'+'a'+'mine'='RE-EXAMINE'

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(Other definitions for re-examine that I've seen before include "Investigate again" , "Look at again" , "Study further" .)

I've seen this clue in The Independent.

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