Crossword Genius

Believe it gets rid of flies (7)

Ross

I believe the answer is:

swallow

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'believe' is the definition.
(swallowing is a kind of believing)

I cannot understand how the rest of the clue works.

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(Other definitions for swallow that I've seen before include "One doesn't make a summer, they say" , "Small migratory bird with forked tail" , "Migrating bird" , "Believe gullibly - bird" , "Fork-tailed bird" .)

I've seen this clue in the Evening Standard.
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