Willing to comply (8)
'willing to comply' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for amenable that I've seen before include "Prepared to fall in with others' plans" , "Acquiescent" , "Easily influenced" , "Open and responsive to suggestion" , "Willing to be guided or controlled" .)
(Other definitions for obedient that I've seen before include "Amenable" , "Doing as one's told" , "Passive" , "co-operative?" , "Deferential" .)