Rook in Englishman's home? (6)
I believe the answer is:
castle
This clue is a double definition.
'rook' is the first definition.
(synonyms)
'englishman's home?' is the second definition.
'in' is the 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" .)