Crossword Genius

Crop brassica from frames (4)

Ross

I believe the answer is:

afro

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'crop' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'brassica from frames' is the wordplay.
'AFRO' is hidden in amongst the letters.
However, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for afro that I've seen before include "Bushy hairstyle" , "Type of 18" , "Big hairstyle" , "Hair-style from Dark Continent" , "One cut" .)

I've seen this clue in The Independent.
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