Getting older drink in silver container (5)
I believe the answer is:
aging
'getting older' is the definition.
(I've seen this before)
'drink in silver container' is the wordplay.
I cannot really understand how this works, but
'drink' could be 'gin' (gin is an alcoholic drink) and 'gin' is present in the answer.
'silver' could be 'ag' (Ag is the chemical symbol for silver) and 'ag' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for aging that I've seen before include "Becoming more grown-up" , "Maturing" , "in decline" , "Getting old" , "development" .)