Secure upgrade for recruit (5)
I believe the answer is:
raise
This could be a double definition.
'secure upgrade' is the first definition.
'raise' can be an answer for 'upgrade' (both can mean to promote or improve). I am not sure about the 'secure' bit.
'for recruit' is the second definition.
(synonyms)
Can you help me to learn more?
(Other definitions for raise that I've seen before include "Make higher" , "To promote" , "Care for during childhood" , "Cultivate by growing" , "More money from America" .)