Fun in Los Angeles? I don't like it! (5)
I believe the answer is:
laugh
'fun' is the definition.
(I have seen 'Good fun' mean 'laugh' so perhaps 'fun' could also mean 'laugh')
'los angeles? i don't like it' is the wordplay.
'los angeles?' becomes 'LA' (abbreviation).
'i don't like it' becomes 'ugh!' (I've seen this in another clue).
'la'+'ugh'='LAUGH'
'in' acts as a link.
(Other definitions for laugh that I've seen before include "scream?" , "Express joy or amusement" , "Fun person" , "Audible expression of amusement" , "Give audible sign of merriment" .)