Handy source of information (6)

I believe the answer is:

manual

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'handy' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for manual that I've seen before include "Working with the hands" , "Work-book" , "Relating to the hands" , "Operated by hand" , "reference book" .)

I've seen this clue in the Evening Standard.

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