Stop, but not to see the woman's frolics in water (8)
I believe the answer is:
Here is my best explanation:
'frolics in water' is the definition.
'stop but not to see the woman's' is the subsidiary indication.
'but not' indicates named letters should be taken away.
'see' becomes 'lo' (archaic word meaning 'look!').
'the woman's' becomes 'shes' (**).
'stop' with 'to' removed is 'sp'.