The French in their way sent up Swiss scientist (5)
I believe the answer is:
euler
'swiss scientist' is the definition.
(I've seen this before)
'the french in their way sent up' is the wordplay.
I cannot quite understand how this works, but
'way' could be 'e' (Compass direction - East) and 'e' is found in the answer.
'the french' could be 'le' ('the' in French) and 'le' is found within the answer.
The remaining letters 'ur' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for euler that I've seen before include "Leonhard -, Eighteenth century Swiss mathematician" , "Leonhard --, C18 Swiss mathematician" , "Noted blind Swiss mathematician" , "18th-century Swiss mathematician and physicist" , "Swiss mathematician; sounds like lubricator" .)