Hi Mike, 

Perhaps you could use the "inverted polygon" renderer to cover/hide
areas outside your area of interest? 

See
https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#inverted-polygon-renderer
or https://www.youtube.com/watch?v=MHhYDdTC2vg  

By using this symbology technique you are not actually clipping the
data, but hide areas ouside a defined polygon "on-the-fly". 

Hope this helps, 

Andreas 

On 2018-11-14 14:42, Michael Jabot wrote:

> I am trying to clip a basemap to a polygon and am struggling. I have tried to 
> follow suggestions from others about doing this but have not been able to 
> make it work. 
> 
> What I am trying to do is use the portion of the basemap for the region in 
> Composer 
> 
> Thank you in advance for any suggestions 
> 
> Mike Jabot
> 
> ************************************* 
> Michael Jabot, Ph.D.
> Professor, Science Education 
> US Partner - _GLOBE Program_ 
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> The State University of New York at Fredonia
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