Remove answer in Gaelic language (5)
I believe the answer is:
erase
'remove' is the definition.
(to erase is to remove)
'answer in gaelic language' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'in' means one lot of letters goes inside another.
'gaelic language' becomes 'erse' (term for the Scottish or Irish language).
'a' put inside 'erse' is 'ERASE'.
(Other definitions for erase that I've seen before include "Scratch" , "Eliminate" , "Rub out, cancel" , "Delete" , "Obliterate" .)