Fallen container, dry (7)

I believe the answer is:

deadpan

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'dry' is the definition.
(I've seen this before)

'fallen container' is the wordplay.
'fallen' becomes 'dead' (I can't explain this - if you can you should give a lot more credence to this answer).
'container' becomes 'pan' (pan is a kind of container).
'dead'+'pan'='DEADPAN'

Can you help me to learn more?

(Other definitions for deadpan that I've seen before include "Showing no expression" , "with emotionless face" , "showing no emotion" , "Betraying no emotion" , "Impassive" .)

I've seen this clue in The Telegraph.

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