Divine young woman starts noticing your speed (5)
I believe the answer is:
nymph
'divine young woman' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'starts noticing your speed' is the wordplay.
'starts' says to take the initial letters.
'speed' becomes 'mph' (miles per hour).
The initial letters of 'noticing your' is 'ny'.
'ny'+'mph'='NYMPH'
Can you help me to learn more?
(Other definitions for nymph that I've seen before include "Demigoddess" , "Young dragonfly" , "eg Dryad" , "Young girl - insect" , "Beautiful young maiden" .)