Go on bended knee as fuel can get tricky out of area (9)
I believe the answer is:
genuflect
'go on bended knee' is the definition.
(to genuflect is to bend a knee in respect)
'fuel can get tricky out of area' is the wordplay.
I cannot really see how this works, but
an anagram of 'fuel' is 'ufle' which is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'as' is the link.
Can you help me to learn more?
(Other definitions for genuflect that I've seen before include "Bend the knee in obeisance" , "Bend the knee as sign of reverence" , "Go down on one knee in homage" , "Show deference" , "Curtsy" .)