Rook in Englishman's home? (6)
I believe the answer is:
castle
I believe this is a double definition.
'rook' is the first definition.
(I know that rook can be written as castle)
'englishman's home?' is the second definition.
'in' acts as a link.
(Other definitions for castle that I've seen before include "Another word for chess rook" , "Fortified place on the chess board" , "Left's Social Services secretary" , "''An Englishman's home is his . . .''" , "Fortified stronghold" .)