The French continue to waterhole (6)
I believe the answer is:
lagoon
'waterhole' is the definition.
I can't tell whether this defines the answer.
'the french continue' is the wordplay.
'the french' becomes 'la' ('the' in French).
'continue' becomes 'go on' (synonyms).
'la'+'goon'='LAGOON'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for lagoon that I've seen before include "Shallow seaside lake" , "A salt-water lake in the sea" , "A slat-water lake" , "Pool" , "Atoll's enclosed water" .)