Petra's colour returned in seaside resort (4-3)
I believe the answer is:
rose-red
'petra's colour' is the definition.
I can't tell whether this defines the answer.
'returned in seaside resort' is the wordplay.
'returned' says the letters should be written backwards.
'in' says the answer is hidden in the clue.
'deresor' is hidden in the letters of 'seaside resort'.
'deresor' reversed gives 'ROSE-RED'.
Can you help me to learn more?
(Other definitions for rose-red that I've seen before include "A -- city, half as old as time" , "Coloured like a flower" , "Colour (of Burgon's city)" .)