No longer bound to get involved in duet (6)
I believe the answer is:
untied
'no longer bound' is the definition.
(I've seen this before)
'involved in duet' is the wordplay.
'involved' indicates an anagram (involved can mean confusing or complex).
'in'+'duet'='induet'
'induet' anagrammed gives 'UNTIED'.
'to get' is the link.
(Other definitions for untied that I've seen before include "Not fastened" , "No longer bound" , "Undid the knot" , "Loosened" , "Released from 19" .)