Crossword Genius

Becoming bricked in, revolutionary saint surrenders (4,2)

Ross

I believe the answer is:

lets go

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'surrenders' is the definition.
Although both the answer and definition are verbs in their -s form, I don't understand how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lets go that I've seen before include "Releases from one's grip" , "Liberates" , "Order to leave" , "Come on then, we're off!" , "fires" .)

I've seen this clue in The Independent.
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