I Cryptic

[creamegg]

1d it's said to encourage villain
b?a?o

4a gathering includes company male in suit
b?c???

15a regret hospital routine at first
?u?h

16a powerful guys style one observed in apollonian guise
?u???m??

19a meal sorted out before I speak, thats better
??s???r?t?

21a rich celebrated mostly chilled and philosophical
?a?a???t??

23a straight to here after diversion
?e?e??

6d unexpected income after possessing a working cat 5,4
??i?e ?o??

14d doctor about to accept nothing average
???i???e

17d army boss imprisoning almost everyone over course materials
??????

[Mamyalynne]

17 Calico

CiC round Al(l) + O(ver)

clue reads

Coarse/material

[Neveracrossword]

14 Mediocre, average.
6Maine Coon, cat.

[Mamyalynne]

14 Mediocre

Medic round O + re

[Neveracrossword]

15 Ruth, regret. Rut+H.
19 Ameliorate, better.

[Captain2]

4 be-co-me

[Neveracrossword]

21Fatalistic, philosophical. Fat+ A-List+Ic(e).

[Captain2]

23 here-to

[Captain2]

or better.... hetro

[Captain2]

Hetero - get there in a minute

[johnny.5]

bravo?

[Captain2]

1d yes, double def

https://www.thefreedictionary.com/bravo