Climate change effect admitted by Exxon in letter, after a U-turn (2,4)
I believe the answer is:
el nino
'climate change effect' is the definition.
I know that 'climate' relates to this answer.
'admitted by exxon in letter after a u-turn' is the wordplay.
'admitted by' indicates the answer is hidden within the clue.
'a u-turn' says the letters should be written backwards.
'oninle' is hidden in the letters of 'exxon in letter after'.
'oninle' reversed gives 'EL NINO'.
Can you help me to learn more?
(Other definitions for el nino that I've seen before include "Periodic climatic phenomenon" , "Pacific feature affecting climate" , "system of current activity" , "Periodical Pacific weather phenomenon" , "Unusual Pacific condition (Sp. The Christ Child)" .)