To make it easy for yourself your should actually ALWAYS name your frames. Otherwise you will run into problems sooner or later. I will let examples below reflect both named and unnamed frames.
You clear
it:
FIND FIRST tablename NO-LOCK NO-ERROR.
DISPLAY tablename WITH 1 COLUMN.
PAUSE.
CLEAR.
PAUSE.
You can also pinpoint a frame to clear:
FIND FIRST tablename NO-LOCK NO-ERROR.
DISPLAY tablename WITH FRAME x1 1 COLUMN.
PAUSE.
CLEAR FRAME x1.
PAUSE.
Or if clearing is not really what you want but rather removing (or actually hiding) the entire frame:
FIND FIRST tablename NO-LOCK NO-ERROR.
DISPLAY tablename WITH FRAME x1 1 COLUMN.
PAUSE.
HIDE FRAME x1.
PAUSE.
You can also hide without pinpointing a frame:
FIND FIRST tablename NO-LOCK NO-ERROR.
DISPLAY tablename.
PAUSE.
HIDE.
PAUSE.