Go forward right away (4)
I believe the answer is:
bash
'go' is the definition.
(both can mean an attempt)
'forward right away' is the wordplay.
'forward' becomes 'brash' (both can mean confident or arrogant).
'right' becomes 'r' (common abbreviation).
'away' indicates named letters should be taken away.
'brash' with 'r' taken out is 'BASH'.
(Other definitions for bash that I've seen before include "Party - whack" , "box" , "knock" , "Criticise -- social gathering" , "Strike hard; party" .)