Crossword Genius

Physical instruction book (6)

Ross

I believe the answer is:

manual

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This could be a double definition.

'physical' is the first definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'instruction book' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for manual that I've seen before include "Done with the hands" , "Handy" , "Operated by hand" , "Working with the hands" , "Involving human effort" .)

I've seen this clue in The Independent.
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