Scientist negotiated a starry moon role? (10,5)

I believe the answer is:

astronomer royal

'scientist' is the definition.
(I know that Astronomer Royal is a type of scientist)

'negotiated a starry moon role?' is the wordplay.
'negotiated' indicates an anagram.
'a'+'starry'+'moon'+'role'='astarrymoonrole'
'astarrymoonrole' is an anagram of 'ASTRONOMER ROYAL'.

(Another definition for astronomer royal that I've seen is " Appointed skywatcher".)

I've seen this clue in The Telegraph.

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