Crossword Genius

Atlas had every map annotated neatly at first? (5)

Ross

I believe the answer is:

heman

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'atlas' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'had every map annotated neatly at first?' is the wordplay.
'at first?' indicates taking the first letters (I've seen 'at first' mean this).
The initial letters of 'had every map annotated neatly' is 'HEMAN'.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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