Crossword Genius

No brawl disturbs such a light sleeper (4,3)

Ross

I believe the answer is:

barn owl

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

'a light sleeper' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'no brawl disturbs' is the wordplay.
'disturbs' indicates an anagram (I've seen 'disturbed' mean this (the order of letters is disturbed)).
'no'+'brawl'='nobrawl'
'nobrawl' is an anagram of 'BARN-OWL'.

'such' is the link.

Can you help me to learn more?

(Other definitions for barn owl that I've seen before include "Countryside bird" , "Endangered night bird" , "Mottled buff and white night bird" , "Large hunting bird" , "Flier" .)

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