Crossword Genius

Immense rook goes after girl (7)

Ross

I believe the answer is:

stellar

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'immense' is the definition.

I can't explain the remainder of the clue.

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(Other definitions for stellar that I've seen before include "Top-notch" , "Astral" , "celebrity" , "of celebrities" , "Starry" .)

I've seen this clue in The Sun.
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