Affected by kick in a US military training base (4,4)
I believe the answer is:
boot camp
'a us military training base' is the definition.
'affected by kick' is the wordplay.
'affected' becomes 'camp' (I've seen this before).
'by' says to put letters next to each other.
'kick' becomes 'boot' (booting is a kind of kicking).
'camp' after 'boot' is 'BOOT CAMP'.
'in' is the link.
(Other definitions for boot camp that I've seen before include "US naval establishment" , "Harsh (US) military training establishment" , "where terrier potentially goes" , "military unit - with 24d" , "correctional facility" .)