Crossword Genius

Biter bit after losing protection of son (5)

Ross

I believe the answer is:

midge

'biter' is the definition.

I don't understand how the remainder of the clue works.

(Other definitions for midge that I've seen before include "A small biting gnat-like insect" , "Be an obstacle" , "Two-winged fly" , "Tiny swarming insect" , "Small flying insect" .)

I've seen this clue in The Independent.
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