Every now and then, they'll list orders (5)
I believe the answer is:
tells
'orders' is the definition.
(I know this)
'every now and then they'll list' is the wordplay.
'every now and then' indicates alternate letters (letters selected at regular intervals).
'theyll'+'list'='theylllist'
The alternate letters of 'theylllist' are 'TELLS'.
(Other definitions for tells that I've seen before include "Informs, recounts" , "Narrates" , "Counts" .)