Crossword Genius

Class going round rear of medieval fortress (6)

Ross

I believe the answer is:

castle

'fortress' is the definition.
(thesaurus)

'class going round rear of medieval' is the wordplay.
'class' becomes 'caste' (caste is a kind of class).
'going round' is an insertion indicator.
'rear of' indicates one should take the final letters.
The last letter of 'medieval' is 'l'.
'caste' placed around 'l' is 'CASTLE'.

(Other definitions for castle that I've seen before include "E.g. Harlech, Beaumaris, Windsor" , "Stronghold - chessman" , "Fort" , "Large building; rook" , "man of 1d [ADVENTURE]" .)

I've seen this clue in The Times.
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