Hat been thrown under (7)
I believe the answer is:
beneath
'under' is the definition.
(under means beneath or underneath)
'hat been thrown' is the wordplay.
'thrown' indicates an anagram.
'hat'+'been'='hatbeen'
'hatbeen' anagrammed gives 'BENEATH'.
(Other definitions for beneath that I've seen before include "Unbefitting" , "Inferior to" , "in a lower position" , "Directly under" , "At a lower level (than)" .)