Slowcoach at one, rising for some Europeans (8)
I believe the answer is:
italians
'some europeans' is the definition.
(Italian is an example)
'slowcoach at one rising' is the wordplay.
'slowcoach' becomes 'snail' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one' becomes 'i' (Roman numeral).
'rising' shows that the letters should be reversed in order (in a down clue, letters go up).
'snail'+'at'+'i'='snailati'
'snailati' written backwards gives 'ITALIANS'.
'for' is the link.
Can you help me to learn more?
(Other definitions for italians that I've seen before include "Romans, Florentines, etc." , "Natives of Tuscany, say" .)