Performing in duet without restraint (6)

I believe the answer is:

untied

I'm a little stuck... Click here to teach me more about this clue!

'without restraint' is the definition.
I can't judge whether this definition defines the answer.

'performing in duet' is the wordplay.
'performing' is an anagram indicator (the letters move around or 'perform').
'in'+'duet'='induet'
'induet' anagrammed gives 'UNTIED'.

Can you help me to learn more?

(Other definitions for untied that I've seen before include "Released from 19" , "Lacking any fetters" , "'Unfastened, lace say (6)'" , "Disconnected" , "Unfastened, unlaced" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.