Revere Computer Blue (6)
I believe the answer is:
hallow
'revere' is the definition.
(I've seen this in another clue)
'computer blue' is the wordplay.
'computer' becomes 'hal' (I can't justify this - if you can you should believe this answer much more).
'blue' becomes 'low' (both can mean sad).
'hal'+'low'='HALLOW'
Can you help me to learn more?
(Other definitions for hallow that I've seen before include "Consecrate" , "Make holy" .)