Crossword Genius

Alter spaces in printing first of documents (5)

Ross

I believe the answer is:

emend

'alter' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for emend that I've seen before include "change" , "Make improvements or corrections" , "Alter something written to correct errors" , "Improve (writing)" , "get rid of faults" .)

I've seen this clue in The Independent.
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