Laugh seeing the French on pitch (7)
I believe the answer is:
chuckle
'laugh' is the definition.
(I know that laugh can be written as chuckle)
'the french on pitch' is the wordplay.
'the french' becomes 'le' ('the' in French).
'on' is a charade indicator (letters next to each other).
'pitch' becomes 'chuck' (I can't explain this - if you can you should give a lot more credence to this answer).
'le' after 'chuck' is 'CHUCKLE'.
'seeing' acts as a link.
Can you help me to learn more?
(Other definitions for chuckle that I've seen before include "Laugh quietly" , "Tittering laugh" , "Muted laugh" , "Chortle" , "A quiet or half-suppressed laugh" .)