Possibly erected some sculpture by a man (5)
I believe the answer is:
maybe
'possibly' is the definition.
('maybe' can be a synonym of 'possibly')
'erected some sculpture by a man' is the wordplay.
'erected' says the letters should be written backwards.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ebyam' is hidden within 'sculpture by a man'.
'ebyam' in reverse letter order is 'MAYBE'.
(Other definitions for maybe that I've seen before include "Perhaps, possibly" , "Perhaps, might happen" .)