Disinclination to move in developing a rite (7)
I believe the answer is:
inertia
'disinclination to move' is the definition.
(I've seen this before)
'in developing a rite' is the wordplay.
'developing' is an anagram indicator.
'a'+'rite'='arite'
'arite' anagrammed gives 'ertia'.
'in'+'ertia'='INERTIA'
(Other definitions for inertia that I've seen before include "Tendency to remain at rest or in steady motion" , "Passiveness" , "Motionlessness" , "Disinclination to change" , "showing reluctance to move" .)