Philosopher to supply with money around midnight (5)
I believe the answer is:
hegel
'philosopher' is the definition.
(German philosopher Georg Wilhelm Friedrich Hegel)
'with money around midnight' is the wordplay.
'with money' becomes 'heel' (I can't explain this - if you can you should believe this answer much more).
'around' means one lot of letters goes inside another.
'midnight' becomes 'g' (the middle letter in 'night').
'heel' placed around 'g' is 'HEGEL'.
'to supply' is the link.
Can you help me to learn more?
(Other definitions for hegel that I've seen before include "German philosopher, d. 1831" , "German 'dialectic' philosopher" , "Georg Wilhelm ---, Ger. philosopher" .)