Success with the gate, so get out (3,6)
I believe the answer is:
hit wicket
'get out' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'success with the gate' is the wordplay.
'success' becomes 'hit' (a hit is a commercial success).
'with' says to put letters next to each other.
'the gate' becomes 'wicket' (wicket is a kind of gate).
'hit'+'wicket'='HIT WICKET'
'so' is the link.
Can you help me to learn more?
(Other definitions for hit wicket that I've seen before include "Means to get out" , "thus dismissed" , "getting out" .)