Side on border; America in charge; take the consequences (4,3,5)
I believe the answer is:
face the music
'take the consequences' is the definition.
'face the music' can be an answer for 'take' (thesaurus). I'm unsure of the 'the consequences' bit.
'side on border america in charge' is the wordplay.
'side on' becomes 'facet' (I've seen this before. I am not sure about the 'on' bit.).
'border' becomes 'hem' (I've seen this before).
'america' becomes 'US' (United States).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'facet'+'hem'+'us'+'ic'='FACE THE MUSIC'
Can you help me to learn more?
(Other definitions for face the music that I've seen before include "Conductor" , "Pianist will usually" , "Take responsibility" , "Look to score" , "Brave a difficult situation" .)