Fly around central Ireland - it's sunny! (5)
I believe the answer is:
solar
'sunny' is the definition.
Although both the answer and definition are adjectives, I cannot understand how one could define the other.
'fly around central ireland' is the wordplay.
'fly' becomes 'soar' (soaring is a kind of flying).
'around' means one lot of letters goes inside another.
'central' indicates the central letters.
The central letter of 'ireland' is 'l'.
'soar' placed around 'l' is 'SOLAR'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for solar that I've seen before include "of heavenly body" , "like a star" , "Relating to our star" , "Sun-powered" , "sunny?" .)