Crossword Genius

Recap bolt in depths of mine (3,2)

Ross

I believe the answer is:

sum up

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This might be a double definition.

'recap' is the first definition.
(I know that recap is a more specific form of the action sum up)

'bolt in depths of mine' is the second definition.
Although both the answer and definition are verbs in their base form, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for sum up that I've seen before include "What a judge may do" , "Make final precis of evidence" , "Of a judge, give the main points of the evidence for jury" , "Recapitulate (in court)" , "Money more than before" .)

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