For a clear button for to any text entry field/~EditTextWidget (like the 
search bar has)

STEP 1:  While the devs aren't looking, steal the close button code from 
$:/core/ui/SideBarSegments/search 
or from below
STEP 2: paste and modify as shown below

__CODE__:

<$button class="tc-btn-rounded"  style="margin-left:10px;">
<$action-setfield $tiddler="$:/temp/kbshortsearch" searchterm="" />
{{$:/core/images/close-button}}
</$button>


* The class "tc-btn-rounded" can be omitted for a square bordered button or 
replaced with "tc-btn-invisble" for no border.
* "searchterm" is a field name and is usually "text" for a temp tiddler's 
text field. Set it to the field that the ~EditTextWidget is setting and 
with its black value, the button deletes (clears) the value the 
~EditTextWidget had set.

__With a ~EditTextWidget__:

Search: <$edit-text tiddler='$:/temp/kbshortsearch' 
field='searchterm'/><$button 
class="tc-btn-rounded"  style="margin-left:10px;">
<$action-setfield $tiddler="$:/temp/kbshortsearch" searchterm="" />
{{$:/core/images/close-button}}
</$button>

__WORKING EXAMPLE__:

Search: <$edit-text tiddler='$:/temp/kbshortsearch' 
field='searchterm'/><$button 
class="tc-btn-rounded"  style="margin-left:10px;">
<$action-setfield $tiddler="$:/temp/kbshortsearch" searchterm="" />
{{$:/core/images/close-button}}
</$button>

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