Perfume sample setter sprayed about (6)

I believe the answer is:

tester

I'm a little stuck... Click here to teach me more about this clue!

'perfume sample' is the definition.
(I've seen this in another clue)

'setter sprayed about' is the wordplay.
'setter' anagrams to 'TESTER'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for tester that I've seen before include "one experimenting" , "Canopy over mattress or an examiner" , "One who tries out - canopy" , "old coin" , "Examiner of street" .)

I've seen this clue in The Times.

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