Crossword Genius

Decline a rarity engraved with script that's indecipherable? (6,1)

Ross

I believe the answer is:

linear a

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'script that's indecipherable?' is the definition.
I can't tell whether this definition defines the answer.

'decline a rarity engraved with' is the wordplay.
'with' indicates the answer is hidden within the clue.
'LINEAR A' can be found hidden inside 'decline a rarity engraved'.

Can you help me to learn more?

(Another definition for linear a that I've seen is " script yet to be read".)

I've seen this clue in The Irish Times.
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