Instruction from yoga master having addled the brain, pose finally grasped (7,2)
I believe the answer is:
breathe in
'yoga master having addled the brain pose finally grasped' is the definition.
I can't tell whether this defines the answer.
'instruction from' is the wordplay.
'instruction' becomes 'breathe' (I can't justify this - if you can you should give a lot more credence to this answer).
'from' becomes 'in' (I've seen this in other clues).
'breathe'+'in'='BREATHE IN'
Can you help me to learn more?
(Another definition for breathe in that I've seen is " Inhale".)