Initially Narnia author's welcoming less bulky dailies (8)
I believe the answer is:
cleaners
'initially narnia author's' is the definition.
I can't tell whether this defines the answer.
'welcoming less bulky dailies' is the wordplay.
'welcoming' is an insertion indicator (I've seen this in other clues).
'less bulky' becomes 'leaner' (I've seen this before).
'dailies' becomes 'cs' (I am not sure about this - if you are sure you should believe this answer much more).
'leaner' going inside 'cs' is 'CLEANERS'.
Can you help me to learn more?
(Another definition for cleaners that I've seen is " They keep everything spotless".)