Obtained leave, starting tomorrow (3)
I believe the answer is:
got
'obtained' is the definition.
('get' can be a synonym of 'obtain')
'leave starting tomorrow' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'starting' indicates taking the first letters.
The initial letter of 'tomorrow' is 't'.
'go'+'t'='GOT'
(Other definitions for got that I've seen before include "came by" , "Received; understood" , "Caught" , "Acquired" , "Landed" .)