Board rebel battleship, partly capsized (5)
I believe the answer is:
table
'board' is the definition.
('table' can be a synonym of 'board')
'rebel battleship partly capsized' is the wordplay.
'partly' says the answer is hidden in the clue.
'capsized' says the letters should be written in reverse.
'elbat' is hidden in the letters of 'rebel battleship'.
'elbat' back-to-front is 'TABLE'.
(Other definitions for table that I've seen before include "Food - list" , "Board for meals" , "Board; data list" , "Food put on this" , "Array of figures" .)