Some fat tick-birds breeding in the garret (5)

I believe the answer is:

attic

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

'breeding in the garret' is the definition.
'attic' can be an answer for 'garret' (synonyms). I'm unsure of the 'breeding in the' bit.

'some fat tick-birds' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ATTIC' can be found hidden inside 'fat tick birds'.

Can you help me to learn more?

(Other definitions for attic that I've seen before include "room with lots of junk?" , "Room at the top of a house" , "Tacit (anag.)" , "Upper chamber" , "Loft room" .)

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

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