Crossword Genius

Be a shade embarrassed? (6)


I believe the answer is:


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'be' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how one could define the other.

'a shade embarrassed?' is the wordplay.
'a shade' becomes 'red' (red is a colour or shade).
'embarrassed?' becomes 'den' (I can't justify this - if you can you should give a lot more credence to this answer).

Can you help me to learn more?

(Other definitions for redden that I've seen before include "Give visible sign of embarrassment" , "Blush, colour accordingly" , "Group of states under one head" , "Evaluate the nature of (something)" , "Blush or become flushed" .)

I've seen this clue in The Globe and Mail.
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