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Moral type keeping a detective back -- what's the cost? (5,3)

Ross

I believe the answer is:

price tag

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'the cost?' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

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(Other definitions for price tag that I've seen before include "Indication of cost" , "damage shower" , "Label indicating cost" , "Shop goods label" , "Amount to be paid" .)

I've seen this clue in The Telegraph.
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