Medic has authority to remove stuff from the bottom (6)
I believe the answer is:
dredge
'remove stuff from the bottom' is the definition.
'dredge' can be an answer for 'remove' (dredging is a kind of removing). I'm not certain of the 'stuff from the bottom' bit.
'medic has authority' is the wordplay.
'medic' becomes 'dr' (doctor).
'has authority' becomes 'edge' (I am not sure about this - if you are sure you should believe this answer much more).
'dr'+'edge'='DREDGE'
'to' is the link.
Can you help me to learn more?
(Other definitions for dredge that I've seen before include "Clear river bottom" , "Dig up mud from river or canal bed" , "dragnet" , "Dig out mud (from a river, harbour, etc)" , "Dig out mud from (waterway)" .)