Crossword Genius

Close game -- is one on late? (7)

Ross

I believe the answer is:

nightie

I'm a little stuck... Click here to teach me more about this clue!

'one on late?' is the definition.
I can't tell whether this defines the answer.

'close game' is the wordplay.
'close' becomes 'nigh' (similar in meaning).
'game' becomes 'tie' (I've seen this before).
'nigh'+'tie'='NIGHTIE'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for nightie that I've seen before include "Loose dress worn in bed" , "Clothing worn in bed" , "Woman in bed in this" , "Sleeping garment" , "Bedtime attire" .)

I've seen this clue in The Telegraph.
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