Crossword Genius

Investigate possibility of ripping off patient (4)

Ross

I believe the answer is:

case

I'm a little stuck... Click here to teach me more about this clue!

'patient' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for case that I've seen before include "Keep careful watch on" , "Legal action; box of wine" , "Overnight bag" , "Box of twelve bottles of wine" , "Humorous character" .)

I've seen this clue in The Independent.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.