Crossword Genius

Individual is depressed, having only a single piece completed (3,4)

Ross

I believe the answer is:

one down

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'only a single piece completed' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'individual is depressed' is the wordplay.
'individual' becomes 'one' (an individual is one person).
'is depressed' becomes 'down' (synonyms).
'one'+'down'='ONE DOWN'

'having' acts as a link.

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I've seen this clue in The Irish Times.
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