Crossword Genius

A growing reason for MOT failure? (6)

Ross

I believe the answer is:

carrot

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

This clue could be a double definition.

'a growing reason' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'mot failure?' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'for' is the link.

Can you help me to learn more?

(Other definitions for carrot that I've seen before include "veg" , "Incentive (but not the stick)" , "Orange edible root" , "Vegetable - incentive" , "Orange vegetable" .)

I've seen this clue in the Evening Standard.
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