Low level of interest is danger sign during high economic growth (7)
I believe the answer is:
boredom
'low level of interest' is the definition.
(lack of interest)
'danger sign during high economic growth' is the wordplay.
'danger sign' becomes 'red' (as in a red alert).
'during' indicates putting letters inside.
'high economic growth' becomes 'boom' (period of economic growth).
'red' put within 'boom' is 'BOREDOM'.
'is' is the link.
(Other definitions for boredom that I've seen before include "Monotony" , "Ennui in bedroom" , "weary idleness" , "Tedium, ennui" , "Feeling" .)