1) Actuate 2) Cause 3) Constrain 4) Constrain or motivate 5) Drive 6) Drive ahead 7) Drive along 8) Drive by force 9) Drive forward 10) Drive on 11) Drive rascal to the Spanish 12) Drive Sprite bearing left 13) Egg on 14) Encourage 15) Exert moral pressure 16) Force 17) Force along 18) Force an action Found on https://www.crosswordclues.com/clue/impel
Im·pel' transitive verb [ imperfect & past participle Impelled ; present participle & verbal noun Impelling .] [ Latin impellere ; prefix im- in + pellere , pulsum , to drive. See Pulse a beat, and c... Found on http://www.encyclo.co.uk/webster/I/17
to drive or urge forward; press on; incite or constrain to action. · to drive or cause to move onward; propel; impart motion to. Found on https://www.infoplease.com/dictionary/impel