Again I send in the answer (7)
I believe the answer is:
riposte
'answer' is the definition.
(riposting is a kind of answering)
'again i send in the' is the wordplay.
'again' becomes 're'.
'send' becomes 'post' ('post' can be a synonym of 'send'**).
'in the' indicates putting letters inside.
'i'+'post'='ipost'
're' enclosing 'ipost' is 'RIPOSTE'.
(Other definitions for riposte that I've seen before include "Sally" , "Counter-thrust" , "Quick clever reply" , "Quick retort or return thrust in fencing" , "Reply, retort" .)