Ecstasy put one vaguely in connection (3-2)
I believe the answer is:
tie-up
'connection' is the definition.
(I've seen this before)
'ecstasy put one vaguely' is the wordplay.
'ecstasy' becomes 'E' (informal term for the drug).
'one' becomes 'i' (Roman numeral).
'vaguely' is an anagram indicator.
'e'+'put'+'i'='eputi'
'eputi' anagrammed gives 'TIE-UP'.
'in' is the link.
(Other definitions for tie-up that I've seen before include "Moor" , "Link (between companies)" , "Link, connection" , "Bind" , "Association" .)