Maestri remember staying in a boat (7)
I believe the answer is:
trireme
'a boat' is the definition.
(I've seen this before)
'maestri remember staying in' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TRIREME' is hidden within 'maestri remember staying'.
(Other definitions for trireme that I've seen before include "Galley with three banks of oars" , "Roman/Greek galley" , "Ancient rowed ship" , "Ancient warship with three banks of oars" , "Ancient vessel with three banks of oars on each side" .)