Mocked great, upstanding newspaper person (5)
I believe the answer is:
gibed
'mocked' is the definition.
(I've seen this in another clue)
'great upstanding newspaper person' is the wordplay.
'great' becomes 'big' (synonyms).
'upstanding' shows that the letters should be reversed in order.
'newspaper person' becomes 'ed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'big' written backwards gives 'gib'.
'gib'+'ed'='GIBED'
Can you help me to learn more?
(Other definitions for gibed that I've seen before include "Jeered" , "Tormented" .)