Crossword Genius

Aquarium buildup

Ross

I believe the answer is:

scum

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">aquarium buildup</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for scum that I've seen before include "Impurities on surface of liquid - or bad people" , "Impure film" , "Undesirable people" , "Floating impurities or worthless people" , "Impurities on liquid's surface" .)

I've seen this clue in The Mirror.
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