Crossword Genius

The insect that toppled a dynasty (4)

Ross

I believe the answer is:

gnat

'the insect' is the definition.
(gnat is a kind of insect)

'toppled a dynasty' is the wordplay.
'toppled' is a reversal indicator (in a down clue, letters go up).
'a dynasty' becomes 'tang' (Chinese dynasty).
'tang' backwards is 'GNAT'.

'that' acts as a link.

(Other definitions for gnat that I've seen before include "Something with bite" , "Stinging insect" , "Insect like small mosquito" , "insect's" , "a little bit of a nuisance" .)

I've seen this clue in the Sydney Morning Herald.
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