Quiet or busy, wanting constant pick-me-up (11)
I believe the answer is:
restorative
'pick-me-up' is the definition.
(I've seen this before)
'quiet or busy wanting constant' is the wordplay.
I cannot really understand how this works, but
'or' is found in the answer.
'constant' could be 'e' (mathematics: 2.71) and 'e' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for restorative that I've seen before include "Pick-me-up" , "health-promoting medicine" , "Invigorating potion" , "Health-giving medicine" , "promoting recuperation" .)