Hold session in opposition (3)
I believe the answer is:
sit
'hold session' is the definition.
The answer and definition are not the same part of speech.
'in opposition' is the wordplay.
'in' says the answer is hidden in the clue.
'SIT' is hidden within 'opposition'.
Can you help me to learn more?
(Other definitions for sit that I've seen before include "Model" , "Pose for painter" , "Brood" , "I sell badly the cotton yarn" , "Pose (for artist)" .)