Moon starer, possibly (10)
I believe the answer is:
astronomer
'moon starer possibly' is the definition.
I can't judge whether this definition defines the answer.
'moon starer possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'moon'+'starer'='moonstarer'
'moonstarer' anagrammed gives 'ASTRONOMER'.
Can you help me to learn more?
(Other definitions for astronomer that I've seen before include "scientist" , "Moon-starer (anag)" , "Dorado may be contemplated by me" , "Space studier" , "Observer of space" .)