Drink from bedtime bottle full of rum (3,5)
I believe the answer is:
hot toddy
'drink from bedtime' is the definition.
'hot toddy' can be an answer for 'drink' (hot toddy is a kind of drink). I am not sure about the 'from bedtime' bit.
'bottle full of rum' is the wordplay.
'bottle' becomes 'hotty' (I've seen this before).
'full of' means one lot of letters goes inside another.
'rum' becomes 'odd' (rum can mean strange or dubious).
'hotty' going around 'odd' is 'HOT TODDY'.
Can you help me to learn more?
(Other definitions for hot toddy that I've seen before include "warming drink" , "Warm drink of spirit, water, sugar etc" .)