Love Actually expresses a point in speech (6)
I believe the answer is:
orally
'in speech' is the definition.
(oral means relating to speech)
'love actually' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'actually' becomes 'rally' (I can't justify this - if you can you should believe this answer much more).
'o'+'rally'='ORALLY'
'expresses a point' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for orally that I've seen before include "By spoken word" , "given drugs thus?" , "By (word of) mouth" , "via the trap" , "given by mouth" .)