Across
Cola formula, almost pure drink (7)
Spread butter, with end of knife that's used to deliver liquid (7)
See 21 down
'K' is wrestling with Pat (sumo) (9)
Announced fruit's value (5)
One's taken by Mark, perhaps, to be a metalloid (8)
Support needed to hold C sharp (4)
Talk drugs, mustard and marsh, say? (5)
See 22
Fancy doorbell, but not a respectable place (8)
Stage broadcast worry (5)
Instant cure-all, possibly composed of tiny pieces (9)
17a
River transport laboratory item (4,4)
Sharp cousin, several times removed, biting head off fellow (2,5)
Titled person on revolving bar (7)
Down
Band's jacket recommendation? Not black (4)
Hybrid court (8)
Vehicle carrying Latin duo (6)
Iris affected with bust and shoulder inflammation (8)
Sing about high priest's balloon content? (6)
Thumb stuck under a basic building block? (4)
It's probably not good to eat nasty people with a utensil (9)
All right at start of cruise, for example, to go round the Lizard? (5)
Head appearing on large English coin (5)
Wood to sell back disco? (4,4)
'To the bride', perhaps, in German (Browning) (8)
Chemist and singer residing in the outskirts of Darwin (6)
Term for each moon day (6)
9a
Plan to acquire curling rink, including wide, controversial shoulder protection (4,4)
Was a killer from Isleworth? (4)
Type letters or click words in the clue