Separate? See this could be that (5)

I believe the answer is:

apart

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'separate?' is the definition.
('apart' can be similar in meaning to 'separate')

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

Can you help me to learn more?

(Other definitions for apart that I've seen before include "Independently" , "Asunder" , "Separated or at a distance" , "Cut off - in pieces" , "aloof" .)

I've seen this clue in The Times.

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