Signs for about ten drinks (8)
I believe the answer is:
portents
'signs' is the definition.
(portent is a kind of sign)
'about ten drinks' is the wordplay.
'about' indicates putting letters inside.
'drinks' becomes 'ports' (port is a kind of drink**).
'ten' placed into 'ports' is 'PORTENTS'.
'for' acts as a link.
(Other definitions for portents that I've seen before include "Ominous signs" , "Omens" , "Signs of things about to happen" .)