Carefully considered element of order USA embassy’s backing (8)
I believe the answer is:
measured
'carefully considered' is the definition.
(I've seen this before)
'element of order usa embassy's backing' is the wordplay.
'element of' indicates the answer is hidden within the clue (I've seen this in other clues).
'backing' says the letters should be written in reverse.
'derusaem' can be found hidden inside 'order usa embassys'.
'derusaem' backwards is 'MEASURED'.
(Other definitions for measured that I've seen before include "Weighed" , "Rhythmical, regular in movement" , "Sober" , "Deliberate, restrained" , "Unhurried and with care and dignity" .)