Sorry to come between dad and Ena, somewhere (3)

I believe the answer is:

sad

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'sorry' is the definition.
(similar in meaning)

I don't understand the rest of the clue.

(Other definitions for sad that I've seen before include "Dismal" , "low" , "Blue" , "Dejected" , "Doleful" .)

I've seen this clue in the Evening Standard.

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