Where cows may be written about in cookery book (4)
I believe the answer is:
byre
'where cows may' is the definition.
The definition suggests a singular noun which matches the answer.
'written about in cookery book' is the wordplay.
'written about' is a reversal indicator.
'in' says the answer is hidden in the clue.
'eryb' is hidden within 'cookery book'.
'eryb' back-to-front is 'BYRE'.
'be' acts as a link.
Can you help me to learn more?
(Other definitions for byre that I've seen before include "Barn for cattle" , "Neat container" , "neat accommodation" , "Cowhouse" , "Cattle-shed" .)