Depressed feeling Achilles hides (5)

I believe the answer is:

chill

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

'depressed feeling' is the definition.
'chill' can be an answer for 'feeling' (chill is a kind of feeling). I am unsure of the 'depressed' bit.

'achilles hides' is the wordplay.
'hides' says the answer is hidden in the clue.
'CHILL' can be found hidden inside 'achilles'.

Can you help me to learn more?

(Other definitions for chill that I've seen before include "Unpleasant coldness in the air" , "Cool, coolness" , "Make cold; relax" , "Slang injunction to relax - it's cold" , "Sharp cold" .)

I've seen this clue in The Sun.

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