Choose first voting system always blocked by France (6)
I believe the answer is:
prefer
'choose' is the definition.
(I've seen this before)
'first voting system always blocked by france' is the wordplay.
'first' is a charade indicator (letters next to each other).
'voting system' becomes 'pr' (I've seen this in other clues).
'always' becomes 'eer' (poetic way of saying ever).
'blocked by' indicates putting letters inside (I've seen this in other clues).
'france' becomes 'f'.
'eer' placed around 'f' is 'efer'.
'pr' put next to 'efer' is 'PREFER'.
(Other definitions for prefer that I've seen before include "Like one better than another" , "support" , "Value more highly" , "Promote; like better" , "Favour, like better" .)