Tiresome nanny I almost got sacked (8)
I believe the answer is:
annoying
'tiresome' is the definition.
(I've seen this before)
'nanny i almost got sacked' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'sacked' is an anagram indicator.
'got' with its final letter taken away is 'go'.
'nanny'+'i'+'go'='nannyigo'
'nannyigo' is an anagram of 'ANNOYING'.
(Other definitions for annoying that I've seen before include "Bothersome, pesky" , "Irking" , "tiresome" , "Irritating, bothersome" , "Vexing" .)