Struggles to capture large groups of birds in the air (7)
I believe the answer is:
flights
'groups of birds in the air' is the definition.
(flight can mean a group of migrating birds)
'struggles to capture large' is the wordplay.
I cannot quite understand how this works, but
'large' could be 'l' (eg in clothes sizes) and 'l' is located in the answer.
'struggles' could be 'fights' ('fight' can be a synonym of 'struggle') and 'fights' is present in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for flights that I've seen before include "Sets of steps" , "Escapes" , "Air journeys" .)