Selects centre in part processed for plucking (7)

I believe the answer is:

plectra

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'for plucking' is the definition.
I can't judge whether this definition defines the answer.

'selects centre in part processed' is the wordplay.
'centre' means to look at the middle letters.
'in' indicates putting letters inside.
'processed' is an anagram indicator.
The central letters of 'selects' are 'lec'.
'part' anagrammed gives 'ptra'.
'lec' going within 'ptra' is 'PLECTRA'.

Can you help me to learn more?

(Other definitions for plectra that I've seen before include "Bits of plastic maybe" , "Guitar picks" , "Guitar plucking aids" , "Plucky types" , "Parts for harpsichord" .)

I've seen this clue in the Sydney Morning Herald.

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