Dashing young men very attractive in red (9)
I believe the answer is:
bloodshot
'dashing' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'young men very attractive in red' is the wordplay.
'young men' becomes 'bloods' (blood is an old-fashioned term for a young man).
'very attractive in red' becomes 'hot' (I can't explain this - if you can you should give a lot more credence to this answer).
'bloods'+'hot'='BLOODSHOT'
Can you help me to learn more?
(Other definitions for bloodshot that I've seen before include "(Of eye) streaked with red" , "Reddened, inflamed eye" , "Of eyes, red from dilated veins" , "effects of booze?" , "(Of eyes) inflamed" .)