Nimble as a soldier taking the drink round (5)
I believe the answer is:
agile
'nimble' is the definition.
('agile' can be a synonym of 'nimble')
'a soldier taking the drink round' is the wordplay.
'soldier' becomes 'gi' (government issue or general issue).
'taking the drink round' becomes 'le' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'gi'+'le'='AGILE'
'as' is the link.
Can you help me to learn more?
(Other definitions for agile that I've seen before include "Moving quickly and easily" , "Spry - energetic" , "Able to move quickly and easily" , "Nimble, spry" , "Quick in movement" .)