Crossword Genius

Instructions Spooner's group catch (8)

Ross

I believe the answer is:

handbook

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'instructions' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for handbook that I've seen before include "Guide" , "companion" , "Manual, reference" .)

I've seen this clue in The Independent.
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