Fly around central Ireland - it's sunny! (5)
I believe the answer is:
solar
'sunny' is the definition.
(I've seen this in another clue)
'fly around central ireland' is the wordplay.
'fly around' becomes 'sola' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'central' indicates the central letters.
'ireland' becomes 'ire' (abbreviation).
The centre of 'ire' is 'r'.
'sola'+'r'='SOLAR'
'it's' is the 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?" .)