Breakwater (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">breakwater</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for groyne that I've seen before include "A bulwark" , "Structure built to control coastal erosion" , "Protective wall extending into water" , "Sea wall" , "Anti-erosion breakwater" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">breakwater</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pier that I've seen before include "Seaside attraction" , "Buttress; landing place" , "sight at the seaside" , "Ripe as a jetty (4)" , "seaside building" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">breakwater</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mole that I've seen before include "Adrian ---, fancies Pandora; lurking spy" , "Counterspy" , "Furry burrowing animal" , "Agent; breakwater" , "Jetty; animal" .)