Tyro dined after hours (4)
I believe the answer is:
late
'after hours' is the definition.
(I've seen this in other clues)
'tyro dined' is the wordplay.
'tyro' becomes 'l' (**).
'dined' becomes 'ate'.
'l'+'ate'='LATE'
(Other definitions for late that I've seen before include "After the usual time" , "(Of a person) no longer alive" , "Running behind time" , "Behind time; deceased" , "Far on in the day" .)