Once again, went over grass borders in a mood (9)
I believe the answer is:
recrossed
'grass borders in a mood' is the definition.
I can't judge whether this defines the answer.
'once again went over' is the wordplay.
'once again' becomes 're' (prefix in verbs).
'went over' becomes 'crossed' (I've seen this before).
're'+'crossed'='RECROSSED'
Can you help me to learn more?
(Other definitions for recrossed that I've seen before include "passed over again" , "Again went over" .)