Heading an arrest (7)
I believe the answer is:
caption
This could be a double definition.
'heading' is the first definition.
(I know that caption is a type of title)
'an arrest' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
Can you help me to learn more?
(Other definitions for caption that I've seen before include "Explanatory words or heading" , "Pontiac (anag)" , "Text under photo" , "Brief description of an illustration" , "Provide (a picture) with a title" .)