Swallowed by pet, a luscious bone (5)
I believe the answer is:
talus
'bone' is the definition.
(talus is a kind of bone)
'swallowed by pet a luscious' is the wordplay.
'TALUS' is hidden in amongst the letters.
However, I'm uncertain how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for talus that I've seen before include "Ankle-bone" , "Foot's part" , "Yarns" , "Ankle bone" .)