Must've sensory disorders -- affecting this? (7,6)
I believe the answer is:
nervous system
'affecting this?' is the definition.
The definition suggests a singular noun which matches the answer.
'must've sensory disorders' is the wordplay.
'disorders' indicates an anagram.
'mustve'+'sensory'='mustvesensory'
'mustvesensory' anagrammed gives 'NERVOUS SYSTEM'.
Can you help me to learn more?
(Other definitions for nervous system that I've seen before include "Human sensory and control network?" , "Body's signals network" , "Body's sensory control apparatus" , "what's central to her functioning" , "Network sending signals all over the body" .)