Where the Ark went fast (6)
I believe the answer is:
ararat
'where the ark went fast' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
Can you help me to learn more?
(Other definitions for ararat that I've seen before include "Supposed resting place of Noah's ark" , "historic landing site" , "Turkish Mount on which Noah's Ark is said to lie" , "original dry dock" , "Turkish Mount said to contain Noah's Ark" .)