Read its unexpected outbursts (7)
I believe the answer is:
tirades
'outbursts' is the definition.
(I've seen this in another clue)
'read its unexpected' is the wordplay.
'unexpected' indicates anagramming the letters.
'read'+'its'='readits'
'readits' is an anagram of 'TIRADES'.
(Other definitions for tirades that I've seen before include "Astride (anag) - diatribes" , "Long angry speeches of criticism or accusation" , "torrents of abuse" , "Speeches of violent denunciation" , "stormy blasts" .)