Fasten securely (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fasten securely</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for anchor that I've seen before include "Ship's fluke" , "One holding firmly in place" , "Set fast" , "Device to keep ship in place" , "Device used to prevent vessel from drifting" .)
(Other definitions for padlock that I've seen before include "Security device for chain etc" , "Detachable security device" , "Securing device" , "E.g. shed, moneybox, fastener" , "Security device with key" .)