Ditch rowdy kerfuffle to cram (4)

I believe the answer is:

dyke

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

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

'rowdy kerfuffle to cram' is the wordplay.
'DYKE' is hidden within the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for dyke that I've seen before include "Ditch; earthwork" , "Flood barrier" , "Anti-flood ditch/wall" , "Dam" , "Boundary earthwork" .)

I've seen this clue in the Sydney Morning Herald.

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