Wagered about pollen scourge (7)
I believe the answer is:
ragweed
'pollen scourge' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'wagered about' is the wordplay.
'about' is an anagram indicator.
'wagered' anagrammed gives 'RAGWEED'.
Can you help me to learn more?
(Other definitions for ragweed that I've seen before include "Unwanted plant with yellow flowers" , "Plant of daisy family" , "Allergenic plant" , "bloomer" , "Threat to horses" .)