What does the cryptic crossword clue "Heather's endlessly head over heels in love (3)" mean?

The definition is "love". The wordplay uses a reversal. LIN (reversal="LIN") = NIL; definition: "love" The answer is NIL.

Heather's endlessly head over heels in love (3)

Times Cryptic #28981 | 26 Down | 2024-07-29 flower