Want iodine distributed all over the country? (10)
I believe the answer is:
nationwide
'all over the country?' is the definition.
(I've seen this before)
'want iodine distributed' is the wordplay.
'distributed' indicates an anagram.
'want'+'iodine'='wantiodine'
'wantiodine' is an anagram of 'NATIONWIDE'.
(Other definitions for nationwide that I've seen before include "Across the whole country" , "for all of us" .)