Go over - to the enemy once more? (12)
I believe the answer is:
recapitulate
'go over' is the definition.
(I've seen this before)
'the enemy once more?' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'more?' could be 'piu' (I've seen this before) and 'piu' is found within the remaining letters.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for recapitulate that I've seen before include "Repeat in summary" , "go over old ground" , "Go over the main points again" , "Sum up" , "Go over in summary" .)