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Collected dirt spec - it's what Cassandra does (8)

Ross

I believe the answer is:

predicts

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'cassandra does' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot understand how they can define each other.

'collected dirt spec it's what' is the wordplay.
'dirt spec' can be anagrammed to 'PREDICTS'.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for predicts that I've seen before include "Foresees" , "Foretells or forecasts" , "Forecasts, maybe the weather" , "Prophesies in scripted way" .)

I've seen this clue in the Irish Times.
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