Reply obtained from letter I posted (7)

I believe the answer is:

riposte

'reply' is the definition.
(riposte is a kind of reply)

'obtained from letter i posted' is the wordplay.
'obtained from' indicates a hidden word.
'RIPOSTE' can be found hidden inside 'letter i posted'.

(Other definitions for riposte that I've seen before include "Quick clever reply" , "Rejoinder" , "Smart reply" , "Quick retort or return hit in fencing" , "Sally" .)

I've seen this clue in The Telegraph.

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