Tantrum, but explosive in our street (8)
I believe the answer is:
outburst
'tantrum' is the definition.
(I've seen this before)
'but explosive in our street' is the wordplay.
'explosive' is an anagram indicator.
'in' means one lot of letters goes inside another.
'street' becomes 'st' (abbreviation).
'but' is an anagram of 'tbu'.
'tbu' placed into 'our' is 'outbur'.
'outbur'+'st'='OUTBURST'
(Other definitions for outburst that I've seen before include "Eruption of violent emotions" , "Unrestrained expression of strong emotion" , "Intense expression of feeling" , "Explosion of emotion" , "Effusion of violent emotion" .)