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1 Across: Mathematical aids for young pupils. 10,4
C*I***A***/ RODS
23 Across: Relating to an abdominal appendage of an arthropod
8 Letters: *R*D*L**
5Down: Needle -like crystals. 8 Letters. **A*H*D*
18 Down: Blackmail 8 Letters *H***A*E

1) https://en.wikipedia.org/wiki/Cuisenaire_rods

5d) rhaphide

18d) chantage

8) urodelan

Fantastic. All new to me. I've learned something today.
Thanks.
CRESSON

You're most welcome Cresson nearly all new to me as well. Ha ha.