Call the bosses - they're responsible (11)

I believe the answer is:

ringleaders

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'responsible' is the definition.
The definition and answer are not the same part of speech.

'call the bosses' is the wordplay.
'call' becomes 'ring' (telephone call).
'the bosses' becomes 'leaders' (boss can mean a leader).
'ring'+'leaders'='RINGLEADERS'

'they're' acts as a link.

Can you help me to learn more?

(Other definitions for ringleaders that I've seen before include "Criminal bosses" , "mischief-makers to be found" .)

I've seen this clue in The Globe and Mail.

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