Voyeur embracing this setter over cardinal (7)
I believe the answer is:
premier
'cardinal' is the definition.
(thesaurus)
'voyeur embracing this setter over' is the wordplay.
'voyeur' becomes 'prier' (I can't explain this - if you can you should give a lot more credence to this answer).
'embracing' is an insertion indicator.
'this setter' becomes 'me' (the setter of the clue).
'over' shows that the letters should be reversed in order.
'me' in reverse letter order is 'em'.
'prier' going around 'em' is 'PREMIER'.
Can you help me to learn more?
(Other definitions for premier that I've seen before include "Chief minister" , "Foremost" , "Earliest" , "First - head of government" , "First in importance" .)