Crossword Genius

Who form lines and swoop down on insects (11)

Ross

I believe the answer is:

descendants

'who form lines' is the definition.

'swoop down on insects' is the wordplay.
'swoop down' becomes 'descend'.
'on' means one lot of letters go next to another.
'insects' becomes 'ants' (ant is a kind of insect).
'descend'+'ants'='DESCENDANTS'

'and' acts as a link.

(Another definition for descendants that I've seen is " Grandkids, e.g.".)

I've seen this clue in The Times.
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