Strangely, dessert in diet is neutral (13)
I believe the answer is:
disinterested
'neutral' is the definition.
(thesaurus)
'strangely dessert in diet' is the wordplay.
'strangely' is an anagram indicator.
'dessert'+'in'+'diet'='dessertindiet'
'dessertindiet' anagrammed gives 'DISINTERESTED'.
'is' is the link.
(Other definitions for disinterested that I've seen before include "Objective - uninvolved" , "With no axe to grind" , "Desire dentist (anag) - free from partiality" , "Impartial" , "Unbiased" .)