Outdoor seating area with 50% in occupation? (5)
I believe the answer is:
patio
'outdoor seating area' is the definition.
(people might sit in a patio)
'in occupation?' is the wordplay.
'in' says the answer is hidden in the clue.
'PATIO' is hidden within 'occupation'.
'with 50' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
(Other definitions for patio that I've seen before include "Barbecue location?" , "Paved area beside house, often in back garden" , "Place to sit" , "Inner courtyard" , "Paved area next to house" .)