Each serving of coffee maybe reported to recover energy (4,2)
I believe the answer is:
perk up
'recover energy' is the definition.
'perk up' can be an answer for 'recover' (perking up is a kind of recovering). I'm not sure about the 'energy' bit.
'each serving of coffee maybe reported' is the wordplay.
I cannot quite understand how this works, but
'each' could be 'per' ('per' can mean for each) and 'per' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for perk up that I've seen before include "Become more lively" , "Become more cheerful" , "Rise briskly" .)