Finally asks who in France is calling for silence at soft squelching sound (6)
I believe the answer is:
squish
'silence at soft squelching sound' is the definition.
I can't tell whether this definition defines the answer.
'finally asks who in france is calling' is the wordplay.
'finally' suggests the final letters.
'who in france' becomes 'qui' (French for 'who').
'is calling' becomes 'sh' (I can't justify this - if you can you should give a lot more credence to this answer).
The last letter of 'asks' is 's'.
's'+'qui'+'sh'='SQUISH'
'for' acts as a link.
Can you help me to learn more?
(Another definition for squish that I've seen is " Squelch".)