assures a certain outcome

GUARANTEE
WordClue
GOALdesired result or outcome
NYMPHThe larva of certain insects
CLERGYleaders within certain religions
SPOTTERlooks for certain things
VOUCHERreceipt or bond with a certain value
RECURRENCEReturn or reversion to a certain state
PREMISEassumption
FREDAstaire, actor