Many times o'er (3)
I believe the answer is:
oft
'many times o'er' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oft that I've seen before include "Frequently in archaic term" , "(In poetry) frequently" , "Many times, to the poet" , "Frequently (poetic)" , "''... in the stilly night'' (Moore melody)" .)