She lights up strikingly (5)
I believe the answer is:
vesta
'lights up strikingly' is the definition.
I can't judge whether this defines the answer.
'she' is the wordplay.
I cannot quite see how this works, but
'she' could be 'esta' and 'esta' is found within the answer.
A single letter 'v' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for vesta that I've seen before include "Roman goddess; match" , "Roman goddess of the hearth" , "Asteroid; goddess; match" , "Hearth goddess; a match" , "heavenly body" .)