To speechify means nothing to a tearabout (5)
I believe the answer is:
orate
'to speechify' is the definition.
(I've seen this before)
'nothing to a tearabout' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'to a tearabout' becomes 'rate' (I can't justify this - if you can you should give a lot more credence to this answer).
'o'+'rate'='ORATE'
'means' is the link.
Can you help me to learn more?
(Other definitions for orate that I've seen before include "Give speech" , "Speak formally" , "Speechify" , "make speeches" , "Make a formal address" .)