Twice a day, gets through to her (3)
I believe the answer is:
ada
'to her' is the definition.
'twice a' is the wordplay.
'twice' becomes 'ad' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ad'+'a'='ADA'
'day gets through' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ada that I've seen before include "-- Lovelace, pioneer in computing" , "Girl's name, one letter short of a man's name" , "girl?" , "Computer language; girl's name" , "Woman" .)