16d Rival work with page about half of course (8)
I have ?p?o???? and am thinking opponent, but after op (work) and p (page) can't see the parsing.
also
24a River attracting bird in Blackburn?(6) I have d?????. Danube? Dee...? the letter ...R ...? can't think of a word that links to Blackburn for the life of me.