Sweet drink to hand when holding court (6)
I believe the answer is:
nectar
'sweet drink' is the definition.
(I've seen this in another clue)
'to hand when holding court' is the wordplay.
'to hand' becomes 'near' (something 'to hand' is something nearby).
'when holding' is an insertion indicator.
'court' becomes 'ct' (abbreviation used in road names).
'near' going around 'ct' is 'NECTAR'.
(Other definitions for nectar that I've seen before include "Sugary secretion" , "Drink of the gods consumed in trance" , "Honey of flowers - drink of the gods" , "sweet thing" , "very nice drink" .)