Crossword Genius

Take in case of broken limb being blue (8)

Ross

I believe the answer is:

downcast

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

'take in case of broken limb' is the wordplay.
'take in' becomes 'down' (downing is a kind of taking in).
'case of broken limb' becomes 'cast' (I can't justify this - if you can you should give a lot more credence to this answer).
'down'+'cast'='DOWNCAST'

Can you help me to learn more?

(Other definitions for downcast that I've seen before include "Dispirited, gloomy" , "Sad" , "disheartened" , "Crestfallen" , "Depressed - looking at the floor?" .)

I've seen this clue in The Telegraph.
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