An eye for an eye (3,3,3)

I think it could be either:

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3,3,3

tit for tat

'an eye for an eye' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for tit for tat that I've seen before include "reprisal" , "satisfaction" , "revenge" , "protection given to Barnet" , "Retaliation called for" .)

I've seen this clue in The Times, The Telegraph and The Guardian.

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