Times Cryptic 27,684

[NeilMunro]

Very grateful for all help with these clues please.
10ac: “Teddy bear’s friend, slender, tucking in tail (9).”
15ac: “Menial’s years behind plough (6).”
17dn: “Support for idiots? (6).”
21ac: “Dukes, including peer: - in short, the blooming establishment! (8).”

[Lie-in King]

10a Roosevelt - 'Roo' ([Pooh] bear's friend) + 'sveltE' (tucking in tail; 'E')
15a Flunky - 'y(ears)' (behind) 'flunk' (plough; fail in an exam, eg)
17d Ass-ist
21a Florists - 'fists' (dukes, including) 'lor(d; in short)'

[brainiac]

Roosevelt
Flunky
Assist
Florists

[NeilMunro]

Many thanks!!!