Crossword Genius

Pyrotechnical tosh (3)

Ross

I believe the answer is:

rot

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

'tosh' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'pyrotechnical' is the wordplay.
'ROT' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for rot that I've seen before include "Corruption" , "Decay - nonsense" , "Deterioration" , "Paradise" , "Drivel" .)

I've seen this clue in the Evening Standard.
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