Said to include one working in position (9)
I believe the answer is:
stationed
'said to include one working in position' is the definition.
I can't judge whether this definition defines the answer.
'said to include one working in' is the wordplay.
'said' becomes 'stated' ('state' can be a synonym of 'say').
'to include' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'working in' becomes 'on' (I've seen this in other clues).
'i'+'on'='ion'
'stated' placed around 'ion' is 'STATIONED'.
Can you help me to learn more?
(Another definition for stationed that I've seen is " Set".)