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The writing is on the wall and it can be cutting about endless drug taking locally at institute (8)

Ross

I believe the answer is:

graffiti

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

'the wall and it can be cutting about endless drug taking locally at institute' is the definition.
I can't judge whether this definition defines the answer.

'the writing is' is the wordplay.
I cannot quite understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'writing' could be 'r' (one of the traditional three R's of education) and 'r' is found in the answer.
'is' could be 'ii' (more than one I) and 'ii' is located in the leftover letters.
The remaining letters 'gaff' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'on' acts as a link.

Can you help me to learn more?

(Other definitions for graffiti that I've seen before include "Wall-scribblings" , "Scribblings on public buildings" , "Unwanted writing in public places" , "Writing on the wall" , "Unauthorised public writings" .)

I've seen this clue in The Irish Times and the Irish Times (Crosaire).
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