The most common and most likely answer to this crossword clue is the 8 letter word BESOTTED
I've seen this crossword clue in The Daily Telegraph
B
E
S
O
T
T
E
D
More clues leading to the result BESOTTED
- Dote best, madly infatuated
- Seb, taken aback by over-the-top editor, becoming obsessed
- Intoxicated, so Ted bet foolishly
- Infatuated with best man, harbouring love
- Get seen missing Penny, madly in love
- Intoxicated and hammered around start of opening time
- Potty, having gambled with odds in shop being hidden
- Mad to live with drunk old yob
- Dote best after tumbling head over heels
- Footballer hugging old man in love
Buddy explains!

The straight part
We know that "madly in love" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case madly in love = besotted.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 BESOTTED mean?
BESOTTED verb- To muddle, stupefy, or cause to act foolishly, as with alcoholic liquor or infatuation.
- Infatuated
- Intellectually or morally blinded
- Intoxicated