Singularly dramatic illumination (9)
I believe the answer is:
footlight
'singularly dramatic illumination' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'dramatic illumination' is the wordplay.
'dramatic' becomes 'foot' (I am not sure about this - if you are sure you should believe this answer much more).
'illumination' becomes 'light' (synonyms).
'foot'+'light'='FOOTLIGHT'
Can you help me to learn more?
(Another definition for footlight that I've seen is " Illumination on front of stage floor".)