Shout half-heartedly downstairs (5)

I believe the answer is:

below

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'downstairs' is the definition.
(synonyms)

'shout half-heartedly' is the wordplay.
'shout' becomes 'bellow' (bellow is a kind of shout).
'half' indicates taking half.
'heartedly' becomes 'ow' (I can't explain this - if you can you should believe this answer much more).
'bellow' cut in half is 'bel'.
'bel'+'ow'='BELOW'

Can you help me to learn more?

(Other definitions for below that I've seen before include "Inferior" , "Subordinate to" , "Underneath" , "Beneath" , "in one's cabin" .)

I've seen this clue in The Independent.

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