Cruel fact: you need to get rid of tattoo for promotion (8)
I believe the answer is:
sadistic
'cruel' is the definition.
(I've seen this in another clue)
'fact you need to get rid of tattoo for promotion' is the wordplay.
I cannot really understand how this works, but
'promotion' could be 'ad' (short for advert) and 'ad' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sadistic that I've seen before include "Loving cruelty" , "Cruel and perverted" , "This kind of person enjoys cruelty" , "Enjoying others' pain" , "nasty" .)