Not recognised tossing and turning on new bunk (9)
I believe the answer is:
unbeknown
'not recognised' is the definition.
(I've seen this before)
'tossing and turning on new bunk' is the wordplay.
'tossing and turning' is an anagram indicator.
'on'+'new'+'bunk'='onnewbunk'
'onnewbunk' with letters rearranged gives 'UNBEKNOWN'.
(Other definitions for unbeknown that I've seen before include "without being observed" , "Not recognised" .)