Crossword Genius

Lear boasts about old navigational aids (10)

Ross

I believe the answer is:

astrolabes

'old navigational aids' is the definition.
(instrument historically used for navigation)

'lear boasts about' is the wordplay.
'about' indicates an anagram.
'lear'+'boasts'='learboasts'
'learboasts' with letters rearranged gives 'ASTROLABES'.

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