Crossword Genius

Pest you’ll find on this flower (6)

Ross

I believe the answer is:

danube

I believe this is a double definition.

'pest you'll find on this' is the first definition.
(Budapest is on the Danube)

'flower' is the second definition.
(European river - something which flows)

(Other definitions for danube that I've seen before include "It's blue according to the song" , "Viennese river" , "River flowing through Belgrade, Budapest and Vienna" , "River in Europe" , "South European river" .)

I've seen this clue in The Times.
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