Really ticked off (5)
I believe the answer is:
irate
'really ticked off' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for irate that I've seen before include "I tear away, being annoyed" , "Extremely cross" , "A tier (anag)" , "having got in wax" , "Angry and incensed" .)