Put black coat on setter wearing old sailor's hat (9)
I believe the answer is:
tarpaulin
'old sailor's hat' is the definition.
(oilskin hat)
'put black coat on setter wearing' is the wordplay.
I cannot quite see how this works, but
'black' could be 'tar' (I've seen this in other clues) and 'tar' is found within the answer.
'setter' could be 'i' (the person that set the crossword) and 'i' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tarpaulin that I've seen before include "seaman rarely required" , "waterproof material" , "canvas given treatment?" , "sailor's hat" , "oilskin hat" .)