Crossword Genius

Raise old key (5)

Ross

I believe the answer is:

'raise' is the definition.
(thesaurus)

'old key' is the wordplay.
'old' becomes 'ex'.
'key' becomes 'alt' (the Alt keyboard button).
'ex'+'alt'='EXALT'

(Other definitions for exalt that I've seen before include "Praise, glorify or honor", "Praise, glorify, or honour", "Praise highly", "Laud", "(P) raise".)