Crossword Genius

Completely uniform through sediments (7)

Ross

I believe the answer is:

alluvia

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'sediments' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'completely uniform through' is the wordplay.
'completely' becomes 'all' (synonyms).
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'through' becomes 'via' (I've seen this before).
'all'+'u'+'via'='ALLUVIA'

Can you help me to learn more?

(Other definitions for alluvia that I've seen before include "Clay, silt deposits left by flowing water" , "deposits laid down" , "Material from river beds" .)

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