Take care if it changes - it's a trick (8)

I believe the answer is:

artifice

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'it's a trick' is the definition.
(I've seen this before)

'take care if it changes' is the wordplay.
'care if it' can be anagrammed to 'ARTIFICE'.
Though, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for artifice that I've seen before include "Clever device" , "Clever contrivance" , "a lot of tricks" , "Clever trickery" , "Capital of Tuvalu" .)

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

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