In the bay wrecked ship sunk deep (5)
I believe the answer is:
abyss
'deep' is the definition.
(thesaurus)
'in the bay wrecked ship sunk' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'bay' is 'aby' which is present in the answer.
'ship' could be 'ss' (prefix in ship names eg SS Great Britain) and 'ss' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for abyss that I've seen before include "gaping hole" , "Measureless chasm" , "something rather deep" , "Primal chaos" , "Hell; hole" .)