Both hands held, in one's dotage, some beer (5)
I believe the answer is:
lager
'some beer' is the definition.
(lager is a kind of beer)
'both hands held in one's dotage' is the wordplay.
'both hands' becomes 'LR' (abbreviation for left and right).
'held' indicates putting letters inside.
'in one's dotage' becomes 'age' (I can't justify this - if you can you should believe this answer much more).
'lr' placed around 'age' is 'LAGER'.
Can you help me to learn more?
(Other definitions for lager that I've seen before include "drink in the bar?" , "Light beer needed" , "Lout's drink?" , "Regal sort of beer" , "Drink - 5 down (anag)" .)