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Last one to finish this week.
14ac (8) Try stopping a doctor chasing a very old scientist
A-0-A-R -
I have Avogadro as option, but can't really parse. Any thoughts anyone for solution or explanation much appreciated as ever.

yes, Avogadro = scientist (def)
avo - a v (ery) o(ld)
go - try
a dr - a doctor

Looks good.
Try is a "go"
A very old is "avo"
A doctor is "adr"
Avogadro.

Thanks to you Rusty and Elle . Much appreciated for swift repl(ies)