Crossword Genius

Worrying symptom in wooden box with windows, say (5,5)

Ross

I believe the answer is:

chest pains

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

'wooden box with windows say' is the definition.
I can't judge whether this definition defines the answer.

'worrying symptom in' is the wordplay.
'worrying' becomes 'chests' (I can't explain this - if you can you should give a lot more credence to this answer).
'symptom' becomes 'pain' (pain is a kind of symptom).
'in' indicates putting letters inside.
'chests' enclosing 'pain' is 'CHEST PAINS'.

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