Remove evidence of article written in Gaelic (5)
I believe the answer is:
erase
'remove evidence' is the definition.
(I've seen this in another clue)
'article written in gaelic' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'written in' indicates putting letters inside.
'gaelic' becomes 'Erse' (synonyms).
'a' inserted within 'erse' is 'ERASE'.
'of' acts as a link.
(Other definitions for erase that I've seen before include "Blank out" , "Kill" , "Remove from memory" , "Obliterate" , "Do away with" .)