Call up, getting green light during the latter part of the day (5)
I believe the answer is:
evoke
'call up' is the definition.
('evoke' can be a synonym of 'call up')
'green light during the latter part of the day' is the wordplay.
'green light' becomes 'ok' (I've seen this in other clues).
'during' is an insertion indicator.
'the latter part of the day' becomes 'eve' (I've seen this in other clues).
'ok' put within 'eve' is 'EVOKE'.
'getting' acts as a link.
(Other definitions for evoke that I've seen before include "Call back (memories)" , "Call up; elicit" , "call-up" , "Bring (a thing) to mind" , "Awake memories" .)