Helpful chap making container for beer, perhaps worried about drip (11)
I believe the answer is:
cooperative
'helpful' is the definition.
('cooperative' is associated in meaning with 'helpful')
'chap making container for beer perhaps worried about drip' is the wordplay.
'chap making container for beer perhaps' becomes 'cooper' (cooper means a barrel maker).
'worried' becomes 'ate' (I've seen this before).
'about' means one lot of letters goes inside another.
'drip' becomes 'iv' (intravenous drip).
'ate' going around 'iv' is 'ative'.
'cooper'+'ative'='COOPERATIVE'
(Other definitions for cooperative that I've seen before include "Involving mutual assistance" , "Shared organisation" , "Willing to be of assistance" .)