The most common and most likely answer to this crossword clue is the 2 plus 4 letter word EL NINO
I've seen this crossword clue in The Daily Telegraph
E
L
N
I
N
O
More clues leading to the result EL NINO
- Online confusion — a source of trouble in South America?
- Weather phenomenon represented online
- Old river redirected after introduction of new
- Muses retrogressively about laevo-rotatory circular current
- Climatologists study this in one complex around Lima
- It causes climatic changes in ’09, westbound around Lima
- Newly developed online meteorological feature
- What may affect the weather is broadcast online
- On Nile flowing back, one goes east to find current
- Work online revealing meteorological phenomenon
Buddy explains!
The straight part
We know that "Climatic effect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case climatic effect = el nino.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.