A short campaign, amazingly fantastic in appearance (14)
I believe the answer is:
phantasmagoric
'a short campaign amazingly fantastic in appearance' is the definition.
I can't tell whether this definition defines the answer.
'a short campaign amazingly' is the wordplay.
'amazingly' indicates an anagram.
'a'+'short'+'campaign'='ashortcampaign'
'ashortcampaign' with letters rearranged gives 'PHANTASMAGORIC'.
Can you help me to learn more?
(Other definitions for phantasmagoric that I've seen before include "like a dream" , "Dreamlike" .)