Though a pound short, victualler may be making a profit (9)
I believe the answer is:
lucrative
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for lucrative that I've seen before include "Producing a sizeable profit" , "rewarding" , "Highly profitable" , "Moneymaking" , "Revictual (anag.)" .)