Very ornate pub, old, rather short of vermouth (7)
I believe the answer is:
baroque
'very ornate' is the definition.
(I've seen this in another clue)
'pub old rather short of vermouth' is the wordplay.
'pub' becomes 'bar' (both are drinking establishments).
'old' becomes 'o' (abbreviation as in OT - Old Testament).
'rather' becomes 'quite' (synonyms).
'short of' suggests deleting specific letters.
'vermouth' becomes 'it' (short for 'Italian vermouth' as in 'gin and it').
'quite' with 'it' taken away is 'que'.
'bar'+'o'+'que'='BAROQUE'
(Other definitions for baroque that I've seen before include "Elaborate style" , "Architectural period" , "Highly ornate in style" , "Ornate decorative style" , "Bach's music style" .)