Anger about head of intelligence sacking top spooks (7)
I believe the answer is:
wraiths
'spooks' is the definition.
(I know this)
'anger about head of intelligence sacking top' is the wordplay.
'anger' becomes 'wrath' (synonyms).
'about' indicates putting letters inside.
'head of' indicates taking the first letters.
'top' says to take the initial letters.
The initial letter of 'intelligence' is 'i'.
The first letter of 'sacking' is 's'.
'wrath' enclosing 'i' is 'wraith'.
'wraith'+'s'='WRAITHS'
(Other definitions for wraiths that I've seen before include "Spectres" , "spirits are made" , "They haunt" .)