Member on foot on way in distance sees poisoner (9)
I believe the answer is:
mistletoe
'poisoner' is the definition.
'member on foot on way in distance' is the wordplay.
'member' becomes 'toe' (toe is a kind of member).
'on' means one lot of letters go next to another.
'foot on way in distance' becomes 'mistle' (I can't explain this - if you can you should believe this answer much more).
'toe' put after 'mistle' is 'MISTLETOE'.
'sees' is the link.
Can you help me to learn more?
(Other definitions for mistletoe that I've seen before include "put up for a Christmas function?" , "Viscum album, much sought-after around Christmas" , "Parasitic plant" , "Christmas kissing plant" , "White-berried parasite" .)