Tried out adopting old computer program (6)
I believe the answer is:
editor
'computer program' is the definition.
(editor is a kind of computer program)
'tried out adopting old' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'adopting' is an insertion indicator (inserted letters are taken on or adopted).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'tried' with letters rearranged gives 'editr'.
'editr' going around 'o' is 'EDITOR'.
(Other definitions for editor that I've seen before include "One who revises another's writing" , "Director of publication" , "Magazine head" , "Journalist in charge of publication" , "one to give some publicity?" .)