Sketch out dredger's cladding and stern (5)
I believe the answer is:
draft
'sketch' is the definition.
(I know that draft is a type of sketch)
'out dredger's cladding and stern' is the wordplay.
'out dredger's cladding' becomes 'dr' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'stern' becomes 'aft' (similar in meaning).
'dr'+'aft'='DRAFT'
Can you help me to learn more?
(Other definitions for draft that I've seen before include "Rough version" , "Bank payment order" , "Current of air or preliminary sketch" , "Formulate" , "Preliminary outline" .)