Chip, software, joint effort (8,4)
I believe the answer is:
approach shot
'chip software' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'joint effort' is the wordplay.
'joint' becomes 'approach' (I can't explain this - if you can you should believe this answer much more).
'effort' becomes 'shot' (both can mean an attempt).
'approach'+'shot'='APPROACH SHOT'
Can you help me to learn more?
(Another definition for approach shot that I've seen is " Made by golfers towards the green".)