What does the cryptic crossword clue "Losing energy, more refined sound from pet (4)" mean?

The definition is "sound from pet". The wordplay uses a deletion. PURR (deletion) = PURR; definition: "sound from pet" The answer is PURR.

Losing energy, more refined sound from pet (4)

Guardian Cryptic #29148 | 12 Across | 2023-08-14 flower