Stray in endless moral capriciousness (4)

I believe the answer is:

roam

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'stray' is the definition.
(I know that stray can be written as roam)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for roam that I've seen before include "go on walkabout" , "Wander widely" , "Move about aimlessly" , "Rove or ramble" , "wander around" .)

I've seen this clue in the Evening Standard.

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