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18d Dark Blue cube I put in short bread (7)
I have: O???I?N
23a Exercising restraint in mainland Europe (9)
I have: ???T?N???
8d Flourished according to detective body lacking strength (7)
I have: ?L?C??D but not too sure of these letters

23 Continent - double definition

8 Flaccid ?

Fl(ourished) Ac(cording) + CID

But a bit of a stretch at a parse.

18d: Oxonian = dark blue (def)
oxo - cube
i
nan - short bread.

Thank you mamya
I now realise that 18d is OXONIAN
...but have one more to solve...
19d Most offensively strong class briefly established (7)
I have: R?N?E?T

Thank you elle

19d RANK EST

You're very welcome, Rob.