Plants Scotsman placed in lavatory (8)
I believe the answer is:
gentians
'plants' is the definition.
The answer is an example.
'scotsman placed in lavatory' is the wordplay.
'scotsman' becomes 'ian'.
'placed in' is an insertion indicator (I've seen this in other clues).
'lavatory' becomes 'gents'.
'ian' placed inside 'gents' is 'GENTIANS'.
(Other definitions for gentians that I've seen before include "Plants - antigens (anag)" , "Intensely blue flowers" , "Intense blue flowers" , "bloomers" .)