I threw lager, upsetting forecaster (of male downfall?) (11)

I believe the answer is:

weathergirl

'forecaster of male downfall?' is the definition.
(It's Raining Men is a song by The Weather Girls)

'i threw lager upsetting' is the wordplay.
'upsetting' is an anagram indicator.
'i'+'threw'+'lager'='ithrewlager'
'ithrewlager' with letters rearranged gives 'WEATHERGIRL'.

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