Comfortable part of ecosystem (4)

I believe the answer is:

cosy

'comfortable' is the definition.
(similar in meaning)

'part of ecosystem' is the wordplay.
'part of' indicates a hidden word.
'COSY' is hidden in the letters of 'ecosystem'.

(Other definitions for cosy that I've seen before include "Warm, secure" , "Comfortable; teapot cover" , "Comfy and snug" , "Warm and snug" , "Warm and comfortable" .)

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

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