An hour on the clock dial is called "point
(of the) clock" 
.
"Five o'clock" is 
.
When several units of time are expressed together, the larger
ones come first,
e.g. 
"Wednesday afternoon three o'clock",
not "3 p.m. on Wednesday".
The 
of 
may
be omitted.
"ask
ask", the effect is to minimise the action.
could be
translated as "have a look at", and 
as "have a
little drink".
"one" may be used in the middle, and pronounced
with a neutral tone:
.