Lucrative
'lucrative' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for profitable that I've seen before include "Cost-effective" , "offering good returns" , "useful" , "Rewarding" , "Money-spinning" .)
'lucrative' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gainful that I've seen before include "Bringing in money" , "Profitable and productive" .)