Anticipate old exercise? About time (6)
I believe the answer is:
expect
'anticipate' is the definition.
(I've seen this before)
'old exercise? about time' is the wordplay.
'old' becomes 'ex'.
'exercise?' becomes 'pe'.
'about' becomes 'c' (abbreviation for 'circa'**).
'time' becomes 't'.
'ex'+'pe'+'c'+'t'='EXPECT'
(Other definitions for expect that I've seen before include "Confidently hope" , "Regard as likely, suppose" , "Require as rightfully due" , "Believe about to happen" , "Wait for" .)