Radiant like a cat-eye, said to vanish by morning? (6)
I believe the answer is:
agleam
'radiant' is the definition.
(I've seen this in another clue)
'a cat-eye said to vanish by morning?' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
'morning?' could be 'am' and 'am' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'like' acts as a link.
Can you help me to learn more?
(Other definitions for agleam that I've seen before include "Shining brightly" , "Bright" , "Sparkling" , "scintillating" .)