It's not unusual to hold a position (7)
I believe the answer is:
station
'position' is the definition.
(I know that station is a type of position)
'it's not unusual to hold a' is the wordplay.
'unusual' indicates an anagram.
'to hold' is an insertion indicator.
'its'+'not'='itsnot'
'itsnot' anagrammed gives 'sttion'.
'sttion' enclosing 'a' is 'STATION'.
(Other definitions for station that I've seen before include "Chosen fixed point" , "Regular stopping place on transport system" , "Broadcasting channel" , "position in society?" , "Military base; rail stop" .)