Go, having emptied salt -- salt! (4)
I believe the answer is:
stab
'go' is the definition.
(both can mean an attempt)
'emptied salt salt' is the wordplay.
'emptied' suggests removing the centre.
'salt' becomes 'ab' (I've seen this in other clues).
'salt' with its centre taken out is 'st'.
'st'+'ab'='STAB'
'having' acts as a link.
(Other definitions for stab that I've seen before include "Sudden sharp pain" , "Wound with blade" , "Attack with a knife" , "Impale; attempt" , "Rough guess; to knife" .)