Federation's abundant share (4)

I believe the answer is:

bund

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'federation's' is the definition.
(thesaurus)

'abundant share' is the wordplay.
'BUND' is hidden in amongst the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Another definition for bund that I've seen is " ditch out east".)

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