Office product is to stand out (5)
I believe the answer is:
excel
'is to stand out' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for excel that I've seen before include "Perform extremely well" , "Outrival" , "Do better than, give great performance" , "Show brilliance" , "Surpass; shine" .)