would this work for you? you can set style properties for an option and disable the field so it's not selectable anymore. this question seems to have been answered with another post. default empty option.

<select>
  <option disabled selected value style="display:none"></option>
  <option value="one">one</option>
  <option value="two">three</option>
  
</select>

Just add option with value undefined to force angular to select that value. like below

<select class="custom-select" formControlName="subindustryName">
    <option value="undefined"></option>
    <option *ngFor="let subindustry of subIndustries" 
    [value]="subindustry.value">{{subindustry.label}}</option>
</select>

and with if you want to it to be not selectable then add 'disabled' attribute with that.

EDIT AS PER COMMENT

so whatever you pasted in question should work. Here is my code snippet which is working..

<div class="form-group">
  <label class="col-md-3 control-label">Gender</label>
    <div class="col-md-3">
      <select id="gender" class="form-control" [(ngModel)]="userModel.gender" name="gender" required >
        <option value="male">Male</option>
        <option value="female">Female</option>
      </select>
    </div>
</div>

Just try with template driven approach for 'subindustryName' and check.

if you use like.

<select>
    <option> Select Option </option>
    <!--  replace above code with --> 
    <option value='' selected> Select Option </option>
</select>

Hope this will work.

<option disabled selected value>Select Option</option>
<option value="one">one</option>
<option value="two">two</option>

In both Safari and Chrome, default disabled selected value is this.