Seeks zoom lens to snap area imposing restrictions (9,4)
I believe the answer is:
smokeless zone
'area imposing restrictions' is the definition.
'seeks zoom lens to snap' is the wordplay.
'to snap' is an anagram indicator.
'seeks'+'zoom'+'lens'='seekszoomlens'
'seekszoomlens' with letters rearranged gives 'SMOKELESS ZONE'.
(Other definitions for smokeless zone that I've seen before include "Restricted area for some types of fuel" , "where fogging is less likely to occur" , "Area in which pollution is controlled" , "not good for the kipper house?" .)