Feel depressed downstairs (5)

I believe the answer is:

below

'downstairs' is the definition.
(synonyms)

'feel depressed' is the wordplay.
'feel' becomes 'be'.
'depressed' becomes 'low' (similar in meaning).
'be'+'low'='BELOW'

(Other definitions for below that I've seen before include "Feel miserable" , "in one's cabin" , "Underneath" , "Lower than" , "as mentioned later" .)

I've seen this clue in The Mirror and The Telegraph.

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