She’s in the family way, disrobing to loosen up (6)
I believe the answer is:
auntie
'family way disrobing to loosen up' is the definition.
I can't judge whether this definition defines the answer.
'she's in the' is the wordplay.
'she' becomes 'aunt' ('she' could refer to an aunt).
'in the' becomes 'ie' (I can't explain this - if you can you should believe this answer much more).
'aunt'+'ie'='AUNTIE'
Can you help me to learn more?
(Other definitions for auntie that I've seen before include "The BBC (coll.)" , "Female relation" , "Relative (familiar)" , "BBC; relative (colloq,)" , "Untie a relative" .)