Get bigger people to stand in for us during month (7)
I believe the answer is:
augment
'get bigger' is the definition.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for augment that I've seen before include "boost" , "get longer" , "Grow - intensify" , "Swell" , "Make greater in size, number, etc." .)