Play about princess left by Aeschylus in the end (7)
I believe the answer is:
disport
'play about' is the definition.
(I've seen this before)
'princess left by aeschylus in the end' is the wordplay.
'princess' becomes 'di'.
'left' becomes 'port' (left side of a ship - opposite of starboard**).
'by' means one lot of letters go next to another.
'in the end' indicates one should take the final letters.
The final letter of 'aeschylus' is 's'.
'port' put after 's' is 'sport'.
'di'+'sport'='DISPORT'
(Other definitions for disport that I've seen before include "Cavort, lark about" , "Play about" , "Amuse" , "to have a good time" .)