Proves false and won't take son out for tea, we're told (7)
I believe the answer is:
refutes
'proves false' is the definition.
(I've seen this in another clue)
'won't take son out for tea we're told' is the wordplay.
I cannot really see how this works, but
'take' could be 'r' (abbreviation for 'recipe', Latin for 'take') and 'r' is present in the answer.
'son' could be 's' (genealogical abbreviation for son) and 's' is located in the answer.
'tea' could be 't' (I've seen this in other clues) and 't' is found in the answer.
This explanation may well be incorrect...
'and' acts as a link.
(Other definitions for refutes that I've seen before include "Disproves" , "Proves (a statement) wrong" .)