Search for oil curtailed with a second uproar (6)
I believe the answer is:
fracas
'uproar' is the definition.
(I've seen this before)
'search for oil curtailed with a second' is the wordplay.
'search for oil' becomes 'frack' (fracking is way of finding oil).
'curtailed' means to remove the last letter.
'with' says to put letters next to each other.
'second' becomes 's' (common abbreviation).
'frack' with its final letter taken off is 'frac'.
'frac'+'a'+'s'='FRACAS'
(Other definitions for fracas that I've seen before include "Brawl, disturbance" , "Bust-up" , "Trouble" , "Fight" , "Skirmish" .)