Learnt to play the horn? (6)

I believe the answer is:

antler

'horn?' is the definition.
(antler is a kind of horn)

'learnt to play' is the wordplay.
'to play' indicates anagramming the letters.
'learnt' anagrammed gives 'ANTLER'.

'the' acts as a link.

(Other definitions for antler that I've seen before include "Deer-horn" , "Stag horn" , "Branch" , "Deer's branching horn" , "Animal's extension" .)

I've seen this clue in The Sun, the Evening Standard, The Mirror and The Daily Express.

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