Justify international being taken in by former scheme (7)
I believe the answer is:
explain
'justify' is the definition.
(explaining is a kind of justifying)
'international being taken in by former scheme' is the wordplay.
'international' becomes 'i' (abbreviation eg in IMF).
'being taken in by' is an insertion indicator.
'former' becomes 'ex'.
'scheme' becomes 'plan' (I've seen this before).
'ex'+'plan'='explan'
'i' inserted inside 'explan' is 'EXPLAIN'.
(Other definitions for explain that I've seen before include "Make comprehensible" , "Spell out" , "Expound" , "Justify" , "Interpret" .)