Obligatory rise in desire, receiving moving caress (9)
I believe the answer is:
necessary
'obligatory' is the definition.
(similar in meaning)
'rise in desire receiving moving caress' is the wordplay.
'rise in' is a reversal indicator.
'desire' becomes 'yen' (yen can mean a longing or desire).
'receiving' indicates putting letters inside.
'moving' is an anagram indicator (letters are moved around).
'yen' backwards is 'ney'.
'caress' with letters rearranged gives 'cessar'.
'ney' going around 'cessar' is 'NECESSARY'.
(Other definitions for necessary that I've seen before include "Required to be done" , "Indespensable, essential" , "Requisite" , "Inescapable" , "Required, needed" .)