Love to appear in something gripping, say (5)
I believe the answer is:
voice
'say' is the definition.
(voicing is a kind of saying)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for voice that I've seen before include "Computerised analysis of speech" , "tenor, say" , "Give expression to" , "Power of speech" , "Sound of speech" .)