It brings air to the mouth and not into half of body’s frame (7)
I believe the answer is:
snorkel
'it brings air to the mouth' is the definition.
The definition suggests a singular noun which matches the answer.
'and not into half of body's frame' is the wordplay.
'and not' becomes 'nor' ('nor' means 'and also not').
'into' indicates putting letters inside.
'half' becomes 'sk' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'of body's' says to hollow out the word (remove centre letters) (I've seen 'body of' mean this (body can mean something's frame or exterior)).
'frame' becomes 'easel' (I've seen this before).
'easel' with its middle taken out is 'el'.
'nor' inserted into 'sk' is 'snork'.
'snork'+'el'='SNORKEL'
Can you help me to learn more?
(Other definitions for snorkel that I've seen before include "Swimmer's breathing tube" , "Surface swimmer's breathing aid" , "Breathing pipe for swimmers" , "tube at sea" , "(Semi-)underwater breathing apparatus" .)