Outgoing SMS by madman has first letter appearing last (9)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

TEXT (SMS) + (by) RAVER (madman) with first letter at the end (has first letter appearing last) I know this spelling from the Myers-Briggs personality test — I followed the wordplay carefully, but fortunately the A was a checked letter, otherwise I imagine there would have been loads of errors.