17 across: Love each fly (6)

So elegant, so succinct: love = zip, each = per and love each = zipper = fly.

24 across: Milk product includes largely stale milk product (7)

DA finds a milk product in a milk product: milk product = curd, largely stale = sta and milk product includes largely stale = custard = milk product.

2 down: Nervous about wellbeing status (8, 7)

Very amusing anagram: about wellbeing status = sweating bullets = nervous.