Guarantee leaders of economic numbers stabilising (unless recession eventuates) (6)
I believe the answer is:
ensure
'guarantee' is the definition.
(I know that guarantee can be written as ensure)
'leaders of economic numbers stabilising unless recession eventuates' is the wordplay.
'leaders of' says to take the initial letters.
The initial letters of 'economic numbers stabilising unless recession eventuates' is 'ENSURE'.
(Other definitions for ensure that I've seen before include "Make certain, confirm" , "warrant" , "Make certain or safe" , "Make certain for the future" , "Make certain, clinch" .)