### Clue: Old man sacked by competent guy? (5)
### Answer: CABLE 
 ### Explanation: Definition: guy
 "pa"(like "old man", an informal term for one's father) **deleted from**(sacked by) "capable"(competent/having the ability to do something successfully).
Defn: …/a rope or line fixed to the ground to secure a tent or other structure.