A lover from Newcastle, in Spain (8)
I believe the answer is:
casanova
'a lover' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for casanova that I've seen before include "Man noted for his amorous adventures" , "Italian who wrote of his sexual exploits" , "Legendary Italian womaniser" , "Man with reputation as lover of many women" , "Legendary lover" .)