The board has yes in French and German (5)
I believe the answer is:
ouija
'the board' is the definition.
(Ouija board is an example)
'yes in french and german' is the wordplay.
'yes in french' becomes 'oui' (I've seen this in another clue).
'and german' becomes 'ja' (I am not sure about this - if you are sure you should believe this answer much more).
'oui'+'ja'='OUIJA'
'has' is the link.
Can you help me to learn more?
(Other definitions for ouija that I've seen before include "This board is used in spiritualist proceedings" , "- Board may be used in a seance" , "Board for contacting spirits" , "This board is used by spiritualists and seances" , "This board is used in spiritualistic sessions" .)