Quite a show in the sky -- Blackpool Illuminations perhaps (8,6)
I believe the answer is:
northern lights
'quite a show in' is the definition.
I can't tell whether this defines the answer.
'sky blackpool illuminations perhaps' is the wordplay.
'sky blackpool' becomes 'northern' (I can't justify this - if you can you should give a lot more credence to this answer).
'illuminations perhaps' becomes 'lights' (illumination is a kind of light).
'northern'+'lights'='NORTHERN LIGHTS'
'the' is the link.
Can you help me to learn more?
(Other definitions for northern lights that I've seen before include "Blackpool illuminations?" , "What flickers in the sky" , "Celestial phenomenon" , "a must-see for Arctic cruisers?" , "overhead display" .)