French philosopher’s painful introduction to logicism (5)
I believe the answer is:
sorel
'french philosopher's' is the definition.
(Georges Sorel, 1847-1922)
'painful introduction to logicism' is the wordplay.
'painful' becomes 'sore' (synonyms).
'introduction to' says to take the initial letters.
The first letter of 'logicism' is 'l'.
'sore'+'l'='SOREL'
(Other definitions for sorel that I've seen before include "young buck" , "Light chestnut horse" , "Deer" .)