Fly high, capturing first light from the sun (5)
I believe the answer is:
solar
'from the sun' is the definition.
(solar means relating to the sun)
'fly high capturing first light' is the wordplay.
'fly high' becomes 'soar' (soar up into the air).
'capturing' indicates putting letters inside.
'first light' becomes 'l' (1st letter of 'light').
'soar' going around 'l' is 'SOLAR'.
(Other definitions for solar that I've seen before include "Sun-powered" , "Sort of power" , "revolutionary system" , "type of radiation" , "room" .)