Quicken (10)
'quicken' is the definition.
(synonyms)
This is all the clue.
(Other definitions for accelerate that I've seen before include "Go faster" , "snowball" , "Increase speed" , "Quicken" , "Crank up" .)
'quicken' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for advance that I've seen before include "necessary to be recognised?" , "borrowed money" , "Go ahead - forward - loan" , "Put forward (a theory)" , "Forward - loan - make progress" .)