Soldiers in base recalled Missouri as "state of no interest" (7)
I believe the answer is:
boredom
'no interest' is the definition.
(I've seen this before)
'soldiers in base recalled missouri' is the wordplay.
'soldiers' becomes 'OR' (Other Ranks).
'in' indicates putting letters inside.
'base' becomes 'bed' (bed is a kind of base).
'recalled' shows that the letters should be reversed in order.
'missouri' becomes 'mo'.
'mo' back-to-front is 'om'.
'or' placed into 'bed' is 'bored'.
'bored'+'om'='BOREDOM'
'as state of' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for boredom that I've seen before include "Tedium, ennui" , "Feeling" , "Ennui in bedroom" , "Overseers" , "no interest" .)