Was keen about retaining revolutionary live work on program (5)
I believe the answer is:
debug
'work on program' is the definition.
'debug' can be an answer for 'work' (thesaurus). I am not sure about the 'on program' bit.
'was keen about retaining revolutionary live' is the wordplay.
'was keen about' becomes 'dug' (I can't explain this - if you can you should give a lot more credence to this answer).
'retaining' means one lot of letters goes inside another (inserted letters are held or retained).
'revolutionary' is a reversal indicator.
'live' becomes 'be' (synonyms).
'be' backwards is 'eb'.
'dug' placed around 'eb' is 'DEBUG'.
Can you help me to learn more?
(Other definitions for debug that I've seen before include "Remove errors from (programme)" , "Remove error from computer program" , "Correct errors in a computer program" , "Revise programme" , "Pick off insects" .)