Related Clues:
- Ebb and flow of the sea
- Roller — breaker
- Skipper's concern
- 6-Across nickname, with "the"
- Put hand up as gesture we hear to surrender
- Neap or ebb, e.g
- Trend metaphor
- Marine feature that could be permanent
- Bay level variation
- Ship captain's concern
- Signal ''Hello!''
- It's ridden on a surfboard
- Crash diet is affected by the moon
- Certain detergent
- Ebber and flower?