Very grateful for all help with these clues please.
16dn: “Hospital expert tipped to run leaderless institution (9).”
17dn: “One’s invested in phone for rally (8).”
22dn: “Buyer’s limit included in letter (6).”
24dn: “Jet from Brazil unloaded in small enclosure (5).”
26dn: “Scrabble champion’s prime rule (4).”