Undamaged monitor about to be sent back inside (7)
I believe the answer is:
perfect
'undamaged' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for perfect that I've seen before include "Without blemish" , "Ideal, flawless" , "Without fault or defect" , "Make right" , "Faultless" .)