A double blow for the French? (6)
I believe the answer is:
couple
'a double' is the definition.
(I know that Ordered pair can be written as couple)
'blow for the french?' is the wordplay.
'blow' becomes 'coup' (I am not sure about this - if you are sure you should believe this answer much more).
'for' says to put letters next to each other.
'the french?' becomes 'le' ('the' in French).
'coup'+'le'='COUPLE'
Can you help me to learn more?
(Other definitions for couple that I've seen before include "Pair, duo" , "Twosome" , "Married pair; two forces causing rotation" , "Pair - put together" , "The pair to join together" .)