1000 shout out using them (6)

I believe the answer is:

mouths

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'them' is the definition.
I can't judge whether this defines the answer.

'1000 shout out' is the wordplay.
'1000' becomes 'M' (roman numeral).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'shout' is an anagram of 'ouths'.
'm'+'ouths'='MOUTHS'

'using' is the link.

Can you help me to learn more?

(Other definitions for mouths that I've seen before include "Openings for food" , "Oral cavities" , "Declaims words pompously" , "Eating orifices" .)

I've seen this clue in The Irish Independent.

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