Crossword Genius

Due to the clamp, being, indeed, unhappy (9)

Ross

I believe the answer is:

depressed

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

'unhappy' is the definition.
(I know this)

'due to the clamp being indeed' is the wordplay.
I cannot quite understand how this works, but
'clamp' could be 'press' (press is a kind of clamp) and 'press' is found within the answer.
The remaining letters 'deed' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for depressed that I've seen before include "Having been pushed down" , "25 [BLUE]" , "Sad or indented" , "Downhearted" , "Flattened downward" .)

I've seen this clue in the Evening Standard.
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