25 across
It
must
go
through
on
time
they
regularly
stress
(9)
It must go through on time they regularly stress (9)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition here is stress, in the sense of emphasising or repeating. Build it up as a charade: RE for "on" (as in a memo heading), then IT, then ERA for "time", and finally the regular (alternate) letters of "they" giving TE. Run those together and you get REITERATE.