Flutes concealing early guitar (4)

I believe the answer is:

lute

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'early guitar' is the definition.
'lute' can be an answer for 'guitar' (thesaurus). I'm not sure about the 'early' bit.

'flutes concealing' is the wordplay.
'concealing' says the answer is hidden in the clue.
'LUTE' can be found hidden inside 'flutes'.

Can you help me to learn more?

(Other definitions for lute that I've seen before include "Stringed instrument shaped like a halved egg" , "Old guitar-like instrument played by minstrels" , "Plucked instrument; a sealant" , "clay" , "Elizabethan stringed instrument" .)

I've seen this clue in The Mirror.

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