Slight problem in imaginary numbers, at base level (6)
I believe the answer is:
minima
'numbers at base level' is the definition.
I can't tell whether this definition defines the answer.
'slight problem in imaginary' is the wordplay.
'MINIMA' is hidden in amongst the letters.
But, I'm uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for minima that I've seen before include "Lowest possible amounts" , "Least possible amounts" , "Smallest possible amounts" , "bottoms" , "Stevenson's mutable doctor" .)