The great archer is made to reveal all (4)

I believe the answer is:

tell

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'the great archer' is the definition.
'Tell' can be an answer for 'archer' (folk hero William Tell). I'm unsure of the 'the great' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for tell that I've seen before include "Order" , "Grass - Swiss hero" , "Peach" , "his hitting the apple?" , "Inform - count - Swiss hero" .)

I've seen this clue in The Globe and Mail.

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