Drinker disposing of pounds - one generous to restaurant staff? (6)
I believe the answer is:
tipper
'one generous to restaurant staff?' is the definition.
(someone who 'tips')
'drinker disposing of pounds' is the wordplay.
'drinker' becomes 'tippler' (tippler is a kind of drinker).
'disposing of' suggests deleting specific letters.
'pounds' becomes 'l' (L can represent the monetary pound).
'tippler' with 'l' removed is 'TIPPER'.
(Other definitions for tipper that I've seen before include "One giving a gratuity" , "Dumping truck - one paying gratuity" , "One who is wont to give gratuities" , "Person who gives gratuity" , "One leaving a little extra" .)