18 down
Billionaire
probing
work
unit
soon
(7)
Billionaire probing work unit soon (7)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
"Soon" is your definition there, tucked at the end. For the wordplay, take ERG, the unit of work, and slot the billionaire ELON (yes, Musk) right inside it, splitting it as ER-ELON-G to build the whole thing.