First take some cookery books (5)
I believe the answer is:
tomes
'books' is the definition.
(tome is a kind of book)
'first take some cookery' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'some' is 'omes' which is within the answer.
'first take' could be 't' (1st letter of 'take') and 't' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tomes that I've seen before include "Large scholarly books" , "Big books" , "Weighty books" , "works" .)