As well for French and English as English rival? (6)
I believe the answer is:
aussie
'english rival?' is the definition.
(Australia and England are cricket rivals)
'as well for french and english' is the wordplay.
'as well for french' becomes 'aussi' ('also' or 'as well' in French).
'and' means one lot of letters go next to another.
'english' becomes 'E' (abbreviation).
'aussi'+'e'='AUSSIE'
'as' is the link.
(Other definitions for aussie that I've seen before include "Someone from Sydney? (slang)" , "Australian (colloq.)" , "Adelaide native?" , "Briefly and informally, a man from Down Under" , "One from down under" .)