Doctor needs inch lower bed? (6)
I believe the answer is:
dredge
'bed?' is the definition.
(I have seen 'Clean bed' mean 'dredge' so perhaps 'bed' could also mean 'dredge')
'doctor needs inch lower' is the wordplay.
'doctor' becomes 'Dr' (abbreviation).
'needs' means one lot of letters go next to another.
'inch lower' becomes 'edge' (synonyms. I am not sure about the 'lower' bit.).
'dr'+'edge'='DREDGE'
Can you help me to learn more?
(Other definitions for dredge that I've seen before include "River-bed clearer" , "Clean out the bed of a river or harbour" , "Dig up mud from river or canal bed" , "Scoop out (bed of harbour, river, etc.)" , "Dig out mud from (waterway)" .)