Risky transplanting used organ (9)

I believe the answer is:

dangerous

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'risky' is the definition.
(similar in meaning)

'transplanting used organ' is the wordplay.
'used organ' anagrams to 'DANGEROUS'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for dangerous that I've seen before include "Not safe" , "Pope: 'A little learning is a . . . . . . . . . thing'" , "Unsafe, risky" , "Harmful, injurious" , "posing a threat" .)

I've seen this clue in The Sun.

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