Crossword Genius

In report gloss over mutual-aid organisation (5)

Ross

I believe the answer is:

guild

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'organisation' is the definition.
(guild is a kind of organization)

I can't explain the rest of the clue.

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(Other definitions for guild that I've seen before include "Group of craftsmen" , "Trade union" , "Alliance" , "corporation" , "Medieval association of merchants" .)

I've seen this clue in The Telegraph.
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