Go wild seeing permit with tear (3,3)
I believe the answer is:
let rip
'go wild' is the definition.
(I've seen this before)
'permit with tear' is the wordplay.
'permit' becomes 'let' ('let' can be a synonym of 'permit').
'with' means one lot of letters go next to another.
'tear' becomes 'rip' (ripping is a kind of tearing).
'let'+'rip'='LET RIP'
'seeing' acts as a link.
(Other definitions for let rip that I've seen before include "Express oneself without restraint" , "Act violently" , "Behave uninhibitedly" , "Vent feelings" , "Proceed unrestrained" .)