Powerful speech from either a Labour member ... (7)
I believe the answer is:
oratory
'powerful speech' is the definition.
(oratory means speaking in public)
'either a labour member' is the wordplay.
'either' becomes 'or' (I've seen this in another clue).
'labour member' becomes 'tory' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'or'+'a'+'tory'='ORATORY'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for oratory that I've seen before include "School" , "Rhetoric - place of prayer" , "Cicero's art" , "Small chapel for private worship" , "Eloquent language" .)