driven (9)
'driven' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for forced that I've seen before include "Compelled, coerced" , "Strained, unnatural" , "Compelled or obliged" , "Compelled, made to do something" , "Compelled, made to obey" .)
(Other definitions for powered that I've seen before include "Supplied with energy" , "Supplied the force to function" , "Forcible" , "Wee drop (anag.)" , "fed juice" .)
'driven' is the definition.
(similar in meaning)
This is all the clue.
(Another definition for motivated that I've seen is " made it get going?".)