Real name, last but not first, of Oxford don (5)

I believe the answer is:

lewis

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'oxford don' is the definition.
(C.S.Lewis 1898-1963 the British writer)

'real name last but not first' is the wordplay.
'last' says to take the final letters.
'but not first' becomes 'wis' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The final letters of 'real name' are 'le'.
'le'+'wis'='LEWIS'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for lewis that I've seen before include "Other half of Harris (Hebrides)" , "TV detective" , "- - Carroll (lit)" , "our 1/4 Across [GOLD MEDALLIST] in 2000" , "Cecil Day ---, Poet Laureate" .)

I've seen this clue in The Guardian.

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