Neil formed a queue (4)
I believe the answer is:
line
'a queue' is the definition.
(a line of people)
'neil formed' is the wordplay.
'formed' indicates anagramming the letters.
'neil' with letters rearranged gives 'LINE'.
(Other definitions for line that I've seen before include "Fill" , "column" , "Railway track; wrinkle" , "Formation of one beside another" , "Long mark; direction" .)