The bad end of a carrot (3)

I believe the answer is:

rot

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

'the bad' is the definition.
(I've seen this before)

'end of a carrot' is the wordplay.
'ROT' is hidden within the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for rot that I've seen before include "Drivel" , "Decay - nonsense" , "Rubbish (colloq.)" , "Deteriorate" , "Decompose; rubbish" .)

I've seen this clue in the Evening Standard.

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