This person tucking into meat shuns prepared relish (10)
I believe the answer is:
enthusiasm
'relish' is the definition.
(thesaurus)
'this person tucking into meat shuns prepared' is the wordplay.
'this person' becomes 'i'.
'tucking into' indicates putting letters inside.
'prepared' indicates an anagram.
'meat'+'shuns'='meatshuns'
'meatshuns' with letters rearranged gives 'enthusasm'.
'i' inserted into 'enthusasm' is 'ENTHUSIASM'.
(Other definitions for enthusiasm that I've seen before include "spirit?" , "Gusto; fervour" , "Ardour" , "Avidity" , "Intense and lively interest" .)