Drinks held up, bowed to both sides (5-10)
I believe the answer is:
round-shouldered
'bowed to both sides' is the definition.
(bowed or bent at both shoulders)
'drinks held up' is the wordplay.
'drinks' becomes 'round' (I've seen this before).
'held up' becomes 'shouldered' (held up using one's shoulders).
'round'+'shouldered'='ROUND-SHOULDERED'
(Other definitions for round-shouldered that I've seen before include "appearing to slump?" , "poor posture" , "With a curved upper back" .)