Switch positions round areas for sailing in quiet time (3,6)
I believe the answer is:
off season
'sailing in quiet time' is the definition.
'off season' can be an answer for 'time' (I have seen 'Slack time' mean 'off season' so perhaps 'time' could also mean 'off season'). I'm unsure of the 'sailing in quiet' bit.
'switch positions round areas' is the wordplay.
'switch positions' becomes 'off on' (off and on are positions on a switch).
'round' is an insertion indicator.
'areas' becomes 'seas' (I can't justify this - if you can you should give a lot more credence to this answer).
'offon' enclosing 'seas' is 'OFF-SEASON'.
'for' is the link.
Can you help me to learn more?
(Other definitions for off season that I've seen before include "In less busy time" , "Time of year when usual activity or business is slack" , "slack period" , "in which cricket sides traverse oceans" , "when there's little activity" .)