Stuck on three.
16a. College boy's complete agreement (6). I've got ---s-n
13d. Indulge in trips, taking in unknown firm (10). ---i-l-i--
22. Harry lies about chimney and lights up (6). i-l-m--
Thanks in advance,
Wow, so quick! Thank you jazzgirl.
Hadn't spotted "trips" as the anagram indicator in 13, or "harry" in 22 (but I haven't heard of lum to mean chimney, or the word "illumes" so I was never going to get 22).