Avionics not very developed in island capital (7)
I believe the answer is:
nicosia
'island capital' is the definition.
'Nicosia' can be an answer for 'capital' (capital of Cyprus). I am not sure about the 'island' bit.
'avionics not very developed' is the wordplay.
'not' suggests deleting specific letters.
'very' becomes 'v' (abbreviation).
'developed' indicates anagramming the letters.
'avionics' with 'v' taken away is 'aionics'.
'aionics' is an anagram of 'NICOSIA'.
'in' is the link.
Can you help me to learn more?
(Other definitions for nicosia that I've seen before include "Largest city on Cyprus" , "Mediterranean city" , "Casino I find in Cyprus - that's capital" , "Mediterranean capital" , "European Union's most southerly capital" .)