Win purse I've avidly wanted regularly (7)
I believe the answer is:
prevail
'win' is the definition.
(I know that prevail is a kind of the win)
'purse i've avidly wanted regularly' is the wordplay.
'wanted regularly' indicates alternate letters (letters removed at regular intervals).
'purse'+'ive'+'avidly'='purseiveavidly'
The alternating letters of 'purseiveavidly' are 'PREVAIL'.
(Other definitions for prevail that I've seen before include "Be victorious" , "Be widespread; prove superior" , "Get one's way" , "Win through" , "Be current" .)