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Sadly stuck on the last five - all connected which doesn't help!

10D - They're used in working out part of an equation (8, 4)
PARALLEL ????
26A - River crossed by burning boats (7)
R???C??
32A - It clearly protects specimens in a couple of places in the field (9)
C?V???L??
22D - Photograph game attempt (8)
???????? - presumably ends TRY?
&
37A - Desire exists between married couple in short (4)
?I?T

I trust not too many of the letters supplied are misleading.

10 PARALLEL BARS

32 coverslips
22 snapshot
37 wish

32 coverslips, sorry.

Sorry again, it keeps changing on submission "coverslip".

26 Rubicon (Roman history)

Thanks to Mamya, Ginge & G Kite for responding so quickly.

Vague memories of O Level Algebra still fail to suggest "parallel bars" as having anything to do with equations, but they seem to fit in ; nor had I ever heard of a "coverslip" : neither indeed had the "quick solve" section on this facility so I'm not feeling too ashamed of this ignorance.

Parallel Bars in an equation is the equals sign, =.

Ah, Kilowatt, thanks for the explanation which never would have occurred to me.