Forward's second goal (4)
I believe the answer is:
send
'forward's' is the definition.
(thesaurus)
'second goal' is the wordplay.
'second' becomes 's' (common abbreviation).
'goal' becomes 'end' ('end' can be a synonym of 'goal').
's'+'end'='SEND'
(Other definitions for send that I've seen before include "Forward" , "Cause to go for" , "Mail" , "Sentence to a prison term" , "Despatch, remit" .)