Ladies on regular ferry more relaxed (6)
I believe the answer is:
looser
'more relaxed' is the definition.
(loose can mean relaxed or casual)
'ladies on regular ferry' is the wordplay.
'ladies' becomes 'loo' (as in the ladies toilet).
'on regular ferry' becomes 'ser' (I can't explain this - if you can you should give a lot more credence to this answer).
'loo'+'ser'='LOOSER'
Can you help me to learn more?
(Other definitions for looser that I've seen before include "less secure" , "Rather inaccurate" .)