US state that usually is backed, to some extent (4)
I believe the answer is:
utah
'us state' is the definition.
(state of the USA)
'that usually is backed to some extent' is the wordplay.
'to some extent' indicates the answer is hidden within the clue.
'is backed' says the letters should be written in reverse.
'hatu' is hidden in the letters of 'that usually'.
'hatu' backwards is 'UTAH'.
(Other definitions for utah that I've seen before include "American state associated with Mormons and their faith" , "Bryce Canyon US state" , "A hut marks the State" , "American location" , "The American Morman state" .)