Motivated trade union with a web talk series (8)
I believe the answer is:
actuated
'motivated' is the definition.
(similar in meaning)
'trade union with a web talk series' is the wordplay.
I cannot quite understand how this works, but
'union' could be 'tu' (short for trade union) and 'tu' is found within the answer.
'a' is within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for actuated that I've seen before include "Turned on" , "Set off" .)