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Insistent 80s pop star (7)

Ross

I believe the answer is:

adamant

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'insistent' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for adamant that I've seen before include "Positive or intransigent" , "Refusing to budge" , "Completely determined" , "unshakeable in purpose" , "Inflexible, obdurate" .)

I've seen this clue in The Sun.
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