Landowner has hideout for defence (5)
I believe the answer is:
laird
'landowner' is the definition.
(Scottish term for a landowner)
'hideout for defence' is the wordplay.
'hideout' becomes 'lair'.
'for' is a charade indicator (letters next to each other).
'defence' becomes 'd' (this could be a standard abbreviation of which I'm unaware).
'lair'+'d'='LAIRD'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for laird that I've seen before include "Scots estate owner" , "One's landed in Scotland" , "Scottish owner of large estate" , "Proprietor" , "Big landowner" .)