Force from cable in power line (6)
I believe the answer is:
propel
'force' is the definition.
(thesaurus)
'cable in power line' is the wordplay.
'cable' becomes 'rope' (I've seen this in another clue).
'in' indicates putting letters inside.
'power' becomes 'p' (symbol in physics).
'line' becomes 'l' (used when specifying particular lines from a poem).
'p'+'l'='pl'
'rope' going inside 'pl' is 'PROPEL'.
'from' acts as a link.
(Other definitions for propel that I've seen before include "Drive or push forward as with oars" , "Cause to move forward with force" , "Derive of push forward" , "Push forwards" , "Launch" .)