Photoshop tool (6)
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'photoshop tool' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eraser that I've seen before include "Rubber for removing marks" , "(Pencil, ink) rubber" , "A schoolboy's rubber" , "What a poor artist needs" , "Required, should you make a mistake" .)
(Other definitions for crop that I've seen before include "Bird's gullet pouch" , "Yield -- trim" , "Type of whip" , "Short cut - taken when hunting?" , "Yield from a single growing season" .)