Crossword Genius

I grew annoyed about a little pest (6)

Ross

I believe the answer is:

earwig

I'm a little stuck... Click here to teach me more about this clue!

'little pest' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'i grew annoyed about a' is the wordplay.
'annoyed' indicates anagramming the letters.
'about' is an insertion indicator.
'i'+'grew'='igrew'
'igrew' anagrammed gives 'erwig'.
'erwig' going around 'a' is 'EARWIG'.

Can you help me to learn more?

(Other definitions for earwig that I've seen before include "listen in?" , "Eavesdrop (informal)" , "flatterer" , "An insect, I wager (anag.)" , "Small insect with pincers at end of its body" .)

I've seen this clue in The Globe and Mail.
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