Discovers missing leader and makes money (5)
I believe the answer is:
earns
'makes money' is the definition.
(I've seen this before)
'discovers missing leader' is the wordplay.
'discovers' becomes 'learns' ('learn' can be a synonym of 'discover').
'missing leader' means to remove the first letter (leader meaning lead letter).
'learns' with its first letter taken off is 'EARNS'.
'and' acts as a link.
(Other definitions for earns that I've seen before include "Gains by work" , "Works for pay" , "Gains by labour" , "Merits through work" , "Grosses" .)