On return secure this hotel accommodation (4)
I believe the answer is:
room
'this hotel accommodation' is the definition.
'on return secure' is the wordplay.
'on return' shows that the letters should be reversed in order.
'secure' becomes 'moor' (mooring is a kind of securing).
'moor' back-to-front is 'ROOM'.
(Other definitions for room that I've seen before include "kitchen?" , "Space; part of building" , "Adequate space" , "Space (for elbows?)" , "Place" .)