Annoyed to see castaway sidetrack bully (5)
I believe the answer is:
irked
'annoyed' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for irked that I've seen before include "Distressed" , "Exasperated" , "Vexed, annoyed" , "Irritated, vexed" , "Galled" .)