Times Cryptic 27,894

[NeilMunro]

Very grateful for all help with these clues please.
1ac: “Driven back by hard shot, becoming cross (6).”
5dn: “Commercial manager initially coming in is behind hid publications (3,4).”
6dn: “To keep mentioning Marx appropriate in public (4,2,5).”
7dn: “Expecting finished article: pants (2,3,4).”
21ac: “Advance before meeting resistance, keeping at a distance (7).”

[Lie-in King]

1a Hybrid - 'by h(ard)' (back) + 'rid' (shot)
5d Lad mags - 'ad m(anager; initially)' (in) 'lags' (is behind)
6d Harp on about - 'Harpo (Marx) nab (appropriate) out (in public)'
7d Up the duff - 'up (finished) the (article) duff (pants)'
21a Proffer - 'pre (before) r(esistance)' (keeping) 'off' (at a distance)

[NeilMunro]

Many thanks!!!