Thinks cottage is ramshackle (9)

I believe the answer is:

cogitates

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'thinks' is the definition.
('cogitate' can be a synonym of 'think')

'cottage is ramshackle' is the wordplay.
'cottage is' can be anagrammed to 'COGITATES'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for cogitates that I've seen before include "Thinks deeply" , "Ponders" , "Muses" .)

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

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