She is tart and crisp as hymn ratings get revised (6,5)
I believe the answer is:
granny smith
'she' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?
'tart and crisp as hymn ratings get revised' is the wordplay.
'hymn ratings' anagrams to 'GRANNY SMITH'.
Though, I'm not clear how this is indicated.
'is' is the link.
Can you help me to learn more?
(Other definitions for granny smith that I've seen before include "Hard, green-skinned apple" , "Mrs Anything (anag) - it's green and edible" , "Type of apple" , "Variety of apple" , "Eating apple" .)