Crossword Genius

Stargazing device from earl's boat rebuilt (9)

Ross

I believe the answer is:

astrolabe

'stargazing device' is the definition.
(astronomical instrument)

'earl's boat rebuilt' is the wordplay.
'rebuilt' is an anagram indicator.
'earls'+'boat'='earlsboat'
'earlsboat' with letters rearranged gives 'ASTROLABE'.

'from' is the link.

(Other definitions for astrolabe that I've seen before include "Early astronomical instrument" , "Navigational device" , "heavenly model" , "Navigation aid" , "Old instrument for astronomical measurements" .)

I've seen this clue in The Telegraph.
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