Suspect Greyhound bus cargo ditched by one in lab? (8)
I believe the answer is:
hydrogen
'one in lab?' is the definition.
I know that 'one' relates to this answer. I also know that both the answer and definition are singular nouns
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hydrogen that I've seen before include "Bleach compound" , "Lightest and most abundant of all substances" , "With oxygen, it forms water" , "... ditto: symbol H" , "Gaseous element" .)