Perhaps like Sinbad, sailor put inside escaped (6)
I believe the answer is:
fabled
'perhaps like sinbad' is the definition.
(fabled can mean mythical, like Sinbad)
'sailor put inside escaped' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'put inside' indicates putting letters inside.
'escaped' becomes 'fled' (I've seen this before).
'ab' put into 'fled' is 'FABLED'.
(Other definitions for fabled that I've seen before include "Enshrined in ancient stories or legends" , "Well-known" , "Mythical; imaginary" , "Told of in legends or myths" , "Famous; imaginary" .)