Right to have lied about being irritated (5)
I believe the answer is:
riled
'being irritated' is the definition.
(I've seen this before)
'right to have lied about' is the wordplay.
'right' becomes 'r' (common abbreviation).
'to have' means one lot of letters go next to another.
'about' is an anagram indicator.
'lied' is an anagram of 'iled'.
'r'+'iled'='RILED'
(Other definitions for riled that I've seen before include "Vexed" , "get angry" , "Nettled" , "Irritated, provoked" , "Annoyed" .)