Bran ultimately required in variety of cereal — daily? (7)
I believe the answer is:
cleaner
'daily?' is the definition.
(dated term for a woman cleaner)
'bran ultimately required in variety of cereal' is the wordplay.
'ultimately' says to take the final letters.
'required in' means one lot of letters goes inside another.
'variety of' indicates an anagram.
The last letter of 'bran' is 'n'.
'cereal' with letters rearranged gives 'cleaer'.
'n' inserted inside 'cleaer' is 'CLEANER'.
(Other definitions for cleaner that I've seen before include "Charlady" , "Worker" , "Eg, char" , "Maybe Daily" , "More hygienic" .)