Sent crazy about a wicked lie (6)
I believe the answer is:
mailed
'sent' is the definition.
(mailing is a kind of sending)
'crazy about a wicked lie' is the wordplay.
'crazy' becomes 'mad' (synonyms).
'about' means one lot of letters goes inside another.
'a wicked' indicates anagramming the letters.
'lie' is an anagram of 'ile'.
'mad' placed around 'ile' is 'MAILED'.
(Other definitions for mailed that I've seen before include "Covered with armour or sent by post" , "Posted - wearing armour?" , "Posted letters with armoured fist?" , "Armoured, or posted in America" .)