Vote against concealing one surgeon's inexperience (7)
I believe the answer is:
naivety
'inexperience' is the definition.
(I've seen this before)
'vote against concealing one surgeon's' is the wordplay.
'vote against' becomes 'nay' (I've seen this in another clue).
'concealing' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'surgeon' becomes 'vet' (veterinary surgeon).
'i'+'vet'='ivet'
'nay' placed around 'ivet' is 'NAIVETY'.
(Other definitions for naivety that I've seen before include "Lack of sophistication or worldliness" , "State of innocence or simplicity (7)" , "artlessness" , "Navy tie? (anag)" , "Lack of experience or maturity" .)