A head coach needs time off (4)
I believe the answer is:
each
'a head' is the definition.
(I have seen 'A head' mean 'each' so perhaps 'head' could also mean 'each')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for each that I've seen before include "Every one of a number" , "This way for a place" , "Per capita, apiece" , "Every single one, person or thing" , "Per person" .)