Lear boasts about old navigational aids (10)
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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