An adorable image (4)
I believe the answer is:
idol
'image' is the definition.
(I know that idol is a type of image)
'an adorable' is the wordplay.
'an' becomes 'i' (Roman numeral for one).
'adorable' becomes 'dol' (I am not sure about this - if you are sure you should believe this answer much more).
'i'+'dol'='IDOL'
Can you help me to learn more?
(Other definitions for idol that I've seen before include "Subject of adoration, may be graven" , "Honoured figure" , "Object of worship (or love?)" , "Graven image or greatly admired person" , "Much-loved actor" .)