Dismissal maybe; but half remain at the ground (7)
I believe the answer is:
removal
'dismissal' is the definition.
(I know that removal is a type of dismissal)
'half remain at the ground' is the wordplay.
'half' indicates taking half.
'at' is a charade indicator (letters next to each other).
'the ground' becomes 'oval' (cricket ground).
'remain' halved is 'rem'.
'rem'+'oval'='REMOVAL'
'maybe but' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for removal that I've seen before include "Dismissal" , "The taking (of something) to another place" , "(Act of) taking away" , "Transferral" , "changing places" .)