Endeavour sounding out mere wreckage of ancient galley (7)
I believe the answer is:
trireme
'wreckage of ancient galley' is the definition.
'trireme' can be an answer for 'galley' (trireme is a kind of galley). I also know that 'ancient' relates to this answer.
'endeavour sounding out mere' is the wordplay.
'endeavour' becomes 'try' (synonyms).
'sounding' shows a homophone (sound like).
'out' indicates an anagram.
'try' sounds like 'tri'.
'mere' anagrammed gives 'reme'.
'tri'+'reme'='TRIREME'
Can you help me to learn more?
(Other definitions for trireme that I've seen before include "Ancient Greek or Roman war galley" , "Oar-driven battleship of classical times" , "Roman/Greek galley" , "Ancient warship with three banks of oars" , "Ancient vessel with three banks of oars on each side" .)