Snakes men found in royal house (7)
I believe the answer is:
windsor
'royal house' is the definition.
(Windsor is an example)
'snakes men' is the wordplay.
'snakes' becomes 'winds'.
'men' becomes 'or' (I've seen this in other clues).
'winds'+'or'='WINDSOR'
'found in' acts as a link.
(Other definitions for windsor that I've seen before include "somewhere in Berkshire" , "-chair; -knot; -castle" , "Type of soap" , "Queen's Berkshire residence" , "Royal house (or castle)" .)