5 down
Missing
worker
infected
by
animal
disease
(6)
Missing worker infected by animal disease (6)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Missing. You've got ANT, meaning worker, being "infected by" (i.e., containing) BSE (that animal disease), giving you A(BSE)NT.