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Side by side, last of four snatched by a monster (7)

Ross

I believe the answer is:

abreast

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'side by side' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

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(Other definitions for abreast that I've seen before include "Alongside one another and facing the same way" , "Level in line" , "Level or keeping pace with" , "On a level together" , "shoulder to shoulder" .)

I've seen this clue in The Telegraph.
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