Secure local premises for digital upgrades (4,3)
I believe the answer is:
nail bar
'premises for digital upgrades' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'secure local' is the wordplay.
'secure' becomes 'nail' (both can mean to apprehend or capture).
'local' becomes 'bar' (local can mean someone's local pub).
'nail'+'bar'='NAIL BAR'
Can you help me to learn more?
(Other definitions for nail bar that I've seen before include "Type of beauty parlour" , "Manicurist's establishment" , "Manicure salon" .)