Created eel stew, then slow down (10)
I believe the answer is:
decelerate
'slow down' is the definition.
(synonyms)
'created eel stew' is the wordplay.
'stew' is an anagram indicator.
'created'+'eel'='createdeel'
'createdeel' with letters rearranged gives 'DECELERATE'.
'then' is the link.
(Other definitions for decelerate that I've seen before include "Move more slowly" , "Reduce speed" , "ease up" , "Slow down" .)