Crossword Genius

Illicit drawings German institute acquired after manipulating tariff (8)

Ross

I believe the answer is:

graffiti

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

'illicit drawings' is the definition.
'graffiti' can be an answer for 'drawings' (I've seen this before). I am not certain of the 'illicit' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for graffiti that I've seen before include "Alfresco wall art" , "Defacements on public walls" , "Wall scribblings" , "Wall scribbles" , "Drawing" .)

I've seen this clue in The Hindu.
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