Delete Times and Express, firstly (5)
I believe the answer is:
erase
'delete' is the definition.
(I know that delete can be written as erase)
'times and express firstly' is the wordplay.
'times' becomes 'eras' (era is a kind of time).
'and' is a charade indicator (letters next to each other).
'firstly' says to take the initial letters.
The first letter of 'express' is 'e'.
'eras'+'e'='ERASE'
(Other definitions for erase that I've seen before include "Scratch" , "Do away with" , "Remove all traces of" , "Remove permanently" , "Remove, wipe out" .)