Crossword Genius

Spirit used in an experiment (4)

Ross

I believe the answer is:

peri

'spirit' is the definition.
(I know that peri is a type of spirit)

'in an experiment' is the wordplay.
'in' indicates a hidden word.
'PERI' is hidden in the letters of 'experiment'.

'used' is the link.

(Other definitions for peri that I've seen before include "Prefix denoting 'around'" , "Old Persian fairy" , "Fairy could be ripe" , "Fairy queen" , "Malevolent Persian spirit" .)

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