American warbler without a penny gets a fresh beginning (7)
I believe the answer is:
'a fresh beginning' is the definition.
(I've seen this in another clue)
'american warbler without a penny' is the wordplay.
'american warbler' becomes 'redstart' (I've seen this in another clue).
'without' indicates named letters should be taken away.
'a penny' becomes 'd' (abbreviation e.g. Lsd - pounds, shillings, pence).
'redstart' with 'd' taken away is 'RESTART'.
'gets' acts as a link.
(Other definitions for restart that I've seen before include "Jumping the gun will mean" , "Commence again" , "launch again" , "Begin anew" , "Resume" .)