Backing correct movement in the main? (4)
I believe the answer is:
tide
'movement in the main?' is the definition.
'tide' can be an answer for 'main?' (thesaurus). I'm not sure about the 'movement in the' bit.
'backing correct' is the wordplay.
'backing' says the letters should be written backwards.
'correct' becomes 'edit' (edit can mean to correct or emend).
'edit' in reverse letter order is 'TIDE'.
Can you help me to learn more?
(Other definitions for tide that I've seen before include "Moon-driven sea movement" , "turning point" , "It ebbs and flows" , "Movement of seawater" , "(With time) it waits for no man" .)