### Clue: Casino worker's cough getting worse? (8)
### Answer: CROUPIER 
 ### Explanation: Definition: Casino worker
 CROUP(an infection of the upper airway, characterised by a barking cough like a sea-lion's) + -IER(suffix indicating a comparative, as in "happy/happier", or in this case, "croupy/croupier" for having an infection that is getting worse, you might say).