Harassed clients obtaining design template (7)
I believe the answer is:
stencil
'design template' is the definition.
(stencil for drawing a design with)
'harassed clients' is the wordplay.
'harassed' is an anagram indicator.
'clients' anagrammed gives 'STENCIL'.
'obtaining' acts as a link.
(Other definitions for stencil that I've seen before include "Design device" , "Clients (anag)" , "Cut out pattern for painting a design" , "Text template" , "It helps get uniform print-out" .)