What does the cryptic crossword clue "Resentment shown by loveless messenger (4)" mean?

The definition is "Resentment". The wordplay uses a deletion. ENVY (deletion) = ENVY; definition: "Resentment" The answer is ENVY.

Resentment shown by loveless messenger (4)

Guardian Cryptic #29453 | 8 Down | 2024-08-05 flower