Man follows guide dropping one — that’s how it’s schemed (7)
'it's schemed' is the definition.
(I've seen this before)
'man follows guide dropping one that's' is the wordplay.
I cannot really see how this works, but
'man' could be 'ted' (Ted is a man's name) and 'ted' is found within the answer.
The remaining letters 'plot' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'how' is the link.
Can you help me to learn more?
(Other definitions for plotted that I've seen before include "Plant of damp areas", "Schemed", "was a conspirator".)