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Just three I can't be sure of....

14d Significantly work at keeping on the throne (10)
I have: P?E?N?N?L?Y It must be PREGNANTLY but why?
19d Slam poor service of a dubious nature (3,3)
I have: L?T/?L? If it is LET FLY- why?
21d Without it, start of revue is rather near the knuckle (6)
I have: R?S?U?. It must be be RISQUE but I can't quite see why again

14D P(REGNANT)LY

PLY = work
REGNANT = reigning, on the throne

21D R+IS+QU(it)E

without IT [delete]
rather = QUITE
near the knuckle [def]

19D LET FLY

slam [def]
LET = poor service [tennis]
FLY = surreptitious

Many thanks Syzygy

You're most welcome.

And thanks for following protocol, as I don't have the puzzle. Makes it easy to read.