Very profitable (9)
I believe the answer is:
lucrative
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very profitable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lucrative that I've seen before include "Making a great profit" , "Well-paid" , "Moneymaking" , "rewarding" , "Revictual (anag.)" .)