The most common and most likely answer to this crossword clue is the 8 letter word AMORETTO
I've seen this crossword clue in The Daily Telegraph
A
M
O
R
E
T
T
O
More clues leading to the result AMORETTO
- Transformed art tome with old representation of Cupid
- Lover Romeo, at Juliet’s end becomes distraught
- Crackpot mostly red tomato lover
- Lover Romeo at Juliet’s end becomes distraught
- Lover is increasingly averse to alcohol, cutting a round
- Cupid’s spirit having nothing for one
- Slim-bodied fish-eater aroused by a second lover
- Cupid’s almond-flavoured liqueur on the tongue
Buddy explains!

The straight part
We know that "Lover" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lover = amoretto.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does AMORETTO mean?
AMORETTO noun- (in art) A cupid or putto (representation of a naked baby or small child, often with wings).
- A love poem.
- A male sweetheart, lover.