Board's on edge? (6)
I believe the answer is:
reside
'board's' is the definition.
(board can mean to stay in an establishment)
'on edge?' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'edge?' becomes 'side' (I've seen this before**).
're'+'side'='RESIDE'
(Other definitions for reside that I've seen before include "Make one's home permanently" , "Hang out with" , "Desire (anag) - to live" , "Dwell, be present (in)" , "Dwell in desire" .)