Genus of plants that includes the wood sorrel (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
oxalis
(Other definitions for oxalis that I've seen before include "One responsible for technical matters for a play" , "Wood sorrel or related plant - Lao six (anag)" , "Genus including wood sorrels" , "Wood-sorrel genus" .)