One sung in Los Angeles on the Fourth of July? (3)
I believe the answer is:
lay
'one sung in' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'los angeles on the fourth of july?' is the wordplay.
'los angeles' becomes 'LA' (abbreviation).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'the fourth of july?' becomes 'y' (fourth letter of the word 'July').
'la'+'y'='LAY'
Can you help me to learn more?
(Other definitions for lay that I've seen before include "Air" , "Was lying" , "located" , "Arrange" , "bed" .)