Crossword Genius

Heading an arrest (7)

Ross

I believe the answer is:

caption

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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" .)

I've seen this clue in the Sydney Morning Herald.
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