Supply information to William Archer (4)

I believe the answer is:

tell

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'archer' is the definition.
(folk hero William Tell)

I can't explain the remainder of the clue.

(Other definitions for tell that I've seen before include "Rossini composed opera 'William ....'" , "Count - give an account" , "William . . . . was a legendary Swiss archer" , "work in a bank" , "Instruct" .)

I've seen this clue in The Irish Independent.

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