Excessively complimented pornographic actor’s first lines – 9 must be abbreviated (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

ADULT as an adjective=”pornographic”, with first letter of A-[ctor] inside (“lines” as a verb=to provide an inner lining=to go inside), plus ED (abbreviation of EDITOR at 9ac)