Tyneside became consumed by one broker (9)
I believe the answer is:
negotiate
'broker' is the definition.
'tyneside became consumed by one' is the wordplay.
'tyneside' becomes 'ne' (region in North East of England).
'became' becomes 'got' ('get' can be a synonym of 'become').
'consumed' becomes 'ate' (eating is a kind of consuming).
'by' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'ate' put after 'i' is 'iate'.
'ne'+'got'+'iate'='NEGOTIATE'
(Other definitions for negotiate that I've seen before include "Bring about by mutual agreement" , "Pass round" , "Discuss the terms of an arrangement" , "I get a note (anag) - bargain" , "Try to reach agreement through discussion" .)