Former unit gets money to stop Bond (3-4)
I believe the answer is:
one-time
'former' is the definition.
(I've seen this before)
'unit gets money to stop bond' is the subsidiary indication.
'unit' becomes 'one' ('one' can be a synonym of 'unit'**).
'gets' says to put letters next to each other.
'money' becomes 'm' (abbreviation in economics).
'to stop' means one lot of letters goes inside another.
'bond' becomes 'tie' (I've seen this before).
'm' inserted within 'tie' is 'time'.
'one'+'time'='onetime'
(Other definitions for one-time that I've seen before include "Former" , "Relating to a single occasion" .)