Small stimulant to swallow before bedtime (6)
I believe the answer is:
supper
'swallow before bedtime' is the definition.
I can't judge whether this definition defines the answer.
'small stimulant' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'stimulant' becomes 'upper' (I've seen this before).
's'+'upper'='SUPPER'
'to' is the link.
Can you help me to learn more?
(Other definitions for supper that I've seen before include "Late repast" , "Light evening meal" , "Light, late, meal" , "Eats late" , "Evening repast" .)