Unattached monks' liberty (7)

I believe the answer is:

freedom

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'liberty' is the definition.
(I know that liberty can be written as freedom)

'unattached monks'' is the wordplay.
'unattached' becomes 'free ' (I've seen this before).
'monks'' becomes 'dom' (I can't explain this - if you can you should believe this answer much more).
'free'+'dom'='FREEDOM'

Can you help me to learn more?

(Other definitions for freedom that I've seen before include "Political militant" , "Power to act without restraint" , "Lack of restrictions" , "Liberty, civil liberty" , "outspokenness" .)

I've seen this clue in The Telegraph.

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