Crossword Genius

Sample lacking internal tension is a shocker (6)

Ross

I believe the answer is:

taster

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'sample' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for taster that I've seen before include "A sample to try" , "person in charge of testing" , "Brief sample" , "Small sample" , "Food tester" .)

I've seen this clue in The Irish Times.
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