Crossword Genius

Just one line from a letter (5)

Ross

I believe the answer is:

serif

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

'line from a letter' is the definition.
'serif' can be an answer for 'line' (serif is a kind of line). I'm not certain of the 'from a letter' bit.

'just one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'er' (I've seen this in other clues) and 'er' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for serif that I've seen before include "Letter feature" , "Projection at a letter's end" , "Brazil port" , "Feature of some typefaces" , "Stroke's foot" .)

I've seen this clue in The Globe and Mail.
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