Official river provides cordial ingredient? (11)
I believe the answer is:
elderflower
'cordial ingredient?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'official river' is the wordplay.
'official' becomes 'elder' (elder is a kind of official).
'river' becomes 'flower' (a river flows).
'elder'+'flower'='ELDERFLOWER'
'provides' is the link.
Can you help me to learn more?
(Other definitions for elderflower that I've seen before include "winemaker perhaps" , "Blossom used in wine, cordial" , "winemaker, maybe" , "Source of cordial and home-made wine" , "Blossom used in wines and cordials" .)