Loose woman disturbed by offspring’s secret practices (11)

'loose woman disturbed by offspring's secret practices' is the definition.
I can't tell whether this defines the answer.

'loose woman disturbed by offspring's' is the wordplay.
I cannot quite see how this works, but
'loose' could be 'free' (synonyms) and 'free' is found within the answer.
'offspring' could be 'son' (male offspring) and 'son' is found in the answer.
'woman' could be 'mary' (woman's name) and 'mary' is found in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?