Lights bordering Eastern city (5)
I believe the answer is:
leeds
'city' is the definition.
(city in England)
'lights bordering eastern' is the wordplay.
'lights' becomes 'leds' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bordering' means one lot of letters goes inside another.
'eastern' becomes 'e'.
'leds' enclosing 'e' is 'LEEDS'.
Can you help me to learn more?
(Other definitions for leeds that I've seen before include "22 [FA CUP] runners-up" , "City near Bradford" , "British city and premier division football club" , "West Yorkshire city" , "Yorkshire city - Kent castle" .)