Dodgy cash job requiring student to start late (6)
I believe the answer is:
earner
'dodgy cash job' is the definition.
(illicit job taken to earn cash quickly)
'student to start late' is the wordplay.
'student' becomes 'learner' (I've seen this before).
'to start late' means to remove the first letter (the word starts from its second letter).
'learner' with its initial letter taken away is 'EARNER'.
'requiring' acts as a link.
(Other definitions for earner that I've seen before include "lucrative job" , "Good job" , "way to make money" , "One bringing in wage" , "Someone paid for work" .)