Commercial books including present and sticker? (8)
I believe the answer is:
adherent
'sticker?' is the definition.
(I've seen this before)
'commercial books including present' is the wordplay.
'commercial' becomes 'ad' (abbreviation for advertisement).
'books' becomes 'NT' (abbreviation for New Testament).
'including' means one lot of letters goes inside another.
'present' becomes 'here' (both can mean in attendance).
'ad'+'nt'='adnt'
'adnt' placed around 'here' is 'ADHERENT'.
'and' is the link.
(Other definitions for adherent that I've seen before include "Freak" , "supporter of party" , "Sticking; partisan" , "Supporter, fan" , "Loyal follower - sticks close" .)