He may either be out of get out (7)
I believe the answer is:
striker
'he may either be out' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'get out' is the wordplay.
I cannot really see how this works, but
'get' could be 'strike' (striking is a kind of getting) and 'strike' is found in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for striker that I've seen before include "Football player" , "Goalscorer" , "player likely to score goal" , "One walking a picket-line" , "Worker engaged in official anti-employer action" .)