GP moves cautiously and cleans out bed (7)
I believe the answer is:
dredges
'cleans out bed' is the definition.
I can't judge whether this definition defines the answer.
'gp moves cautiously' is the wordplay.
'gp' becomes 'dr' (I've seen this in other clues).
'moves cautiously' becomes 'edges' (I can't justify this - if you can you should give a lot more credence to this answer).
'dr'+'edges'='DREDGES'
'and' is the link.
Can you help me to learn more?
(Other definitions for dredges that I've seen before include "Clears waterway" , "Remove material from a riverbed" .)