History will accept Sunak as supporter of shipping (7)
I believe the answer is:
topmast
'supporter of shipping' is the definition.
'topmast' can be an answer for 'supporter'. I am not certain of the 'of shipping' bit.
'history will accept sunak' is the wordplay.
'history' becomes 'toast' (I've seen this in another clue).
'will accept' means one lot of letters goes inside another.
'sunak' becomes 'pm' (I can't justify this - if you can you should give a lot more credence to this answer).
'toast' going around 'pm' is 'TOPMAST'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for topmast that I've seen before include "post on board" , "high post" , "High part of sailing ship" , "Sail-supporting section of a ship" , "Part of square-rigged ship" .)