Romeo after a woman at all times (4)
I believe the answer is:
ever
'at all times' is the definition.
('ever' can be a synonym of 'at all times')
'romeo after a woman' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'after' means one lot of letters go next to another.
'a woman' becomes 'eve' (Eve is an example**).
'r' put after 'eve' is 'EVER'.
(Other definitions for ever that I've seen before include "In perpetuity" , "Eternity" , "Veer away endlessly" , "On any occasion" , "Continually" .)