Picture not moving? Just let it go (6)

I believe the answer is:

frozen

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'picture' is the definition.
(I know that Frozen is a picture)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for frozen that I've seen before include "Stiff with cold" , "Turned into ice - brrrr!" , "Glacially cold" , "slippy and icy" , "Like 7 [ICE]" .)

I've seen this clue in The Irish Times.

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