Mast and some old figurehead washed up with the debris (7)
I believe the answer is:
flotsam
'mast and some old figurehead washed up with the debris' is the definition.
I can't judge whether this defines the answer.
'mast and some old figurehead washed up with the debris' is the wordplay.
'and' means one lot of letters go next to another.
'some' suggests taking the first letters.
'washed up' is an anagram indicator (I've seen this in other clues).
'with' indicates putting letters inside.
'the debris' becomes 'l' (I can't justify this - if you can you should give a lot more credence to this answer).
The initial letters of 'old figurehead' is 'of'.
'mast' put after 'of' is 'ofmast'.
'ofmast' with letters rearranged gives 'fotsam'.
'fotsam' going around 'l' is 'FLOTSAM'.
Can you help me to learn more?
(Other definitions for flotsam that I've seen before include "Rubbish on sea" , "Things going adrift" , "Things found floating from a ship" , "Goods lost" , "Wreckage adrift at sea" .)