Crossword Genius

Big box of chocolates had everyone showing thankful faces (5)

Ross

I believe the answer is:

chest

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

'big box' is the definition.
'chest' can be an answer for 'box' (I've seen this before). I'm unsure of the 'big' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for chest that I've seen before include "It's enclosed by the ribs" , "Large box; thorax" , "Bra on it" , "Rib area" , "Treasure (or heart) container" .)

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