Sam, for example, a Republican? That's iffy (7)
I believe the answer is:
unclear
'iffy' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'sam for example a republican?' is the wordplay.
'sam for example' becomes 'uncle' (I am not sure about this - if you are sure you should believe this answer much more).
'republican?' becomes 'r' (political abbreviation).
'uncle'+'a'+'r'='UNCLEAR'
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for unclear that I've seen before include "Not easy to grasp" , "Not easy to see or understand" , "Not apparent" , "Indistinct" , "Poorly described" .)