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12a. Relative of Bonnie wanting half the case about Clyde (5)
N*E*E NIECE ?
19a. Cream unfinished fish is next to (6) B*S*D* BESIDE ?
9d. Being unsuited , out of one’s depth perhaps (6 - 7)
***N*Y - *i*P*N* SKINNY-DIPPING ?

19 Best, cream, unfinished = Bes +Ide, fish.

9, Yes, if you're unsuited you've got no suit, no clothes on!

I think it's Nie, half the letters (wanting half) of Bonnie and the CE is the case, outside letters of Clyde. Nie Ce.

Many thanks malone , not heard of an ide as a fish.

Shipwreck, glad I could help. Ide/fish crops up in crosswords quite often. Chambers says it's closely related to the chub (exciting stuff!). The word 'id' means exactly the same.