Crossword Genius

Seen on TV, they provide details of Ashes scores (4,5)

Ross

I believe the answer is:

test cards

'seen on tv' is the definition.
(a test card is shown on TV between transmissions)

I don't understand the rest of the clue.

(Other definitions for test cards that I've seen before include "on which cricket scores?" , "shown on TV for people tuning in" , "TV images" .)

I've seen this clue in The Guardian.
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