Time old and young get refill when only a bit drunk (3-2)
I believe the answer is:
top-up
'refill when only a bit drunk' is the definition.
I can't tell whether this defines the answer.
'time old and young' is the wordplay.
'time' becomes 't' (abbreviation).
'old' becomes 'o' (abbreviation).
'and' means one lot of letters go next to another.
'young' becomes 'pup' (pup is a kind of young).
't'+'o'+'pup'='TOP-UP'
'get' is the link.
Can you help me to learn more?
(Other definitions for top-up that I've seen before include "Extra addition" , "Supplement" , "Replenished drink" , "Additional amount to restore mobile phone credit, for example" , "Amount required to restore something's level" .)