Not going, having lost the habit? (3,2,5)
I believe the answer is:
out of order
'not going' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for out of order that I've seen before include "excommunicated?" , "Not working; unacceptable" , "Irregularly" , "Not in religious community" , "Letters in an anagram are" .)