On the verge of binding the enemy over — it's taken long enough! (5,4,3)
I believe the answer is:
about time too
'taken long enough' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'on the verge of binding the enemy over' is the wordplay.
'on the verge of' becomes 'about to' (as in being about to do something).
'binding' means one lot of letters goes inside another.
'the enemy' becomes 'time' (the enemy when speaking figuratively).
'over' becomes 'o' (cricket abbreviation).
'aboutto' placed around 'time' is 'abouttimeto'.
'abouttimeto'+'o'='ABOUT TIME TOO'
'it's' acts as a link.
(Another definition for about time too that I've seen is " at last!".)