Lacking confidence, shy (7)
I believe the answer is:
bashful
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">lacking confidence</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">shy</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for bashful that I've seen before include "Coy" , "Neither Happy, Sneezy, Dopey, Grumpy, Sleepy nor Doc!" , "Shy, timid" , "One of Disney's dwarves" , "Shy, easily embarrassed" .)