Miscalculation, as one can put back clerical position (10)
I believe the answer is:
inaccuracy
'miscalculation' is the definition.
(a miscalculation is inaccurate)
'one can put back clerical position' is the wordplay.
'one' becomes 'i' (Roman numeral).
'put back' shows that the letters should be reversed in order.
'clerical position' becomes 'curacy' (position of being a curate).
'can' reversed gives 'nac'.
'i'+'nac'+'curacy'='INACCURACY'
'as' acts as a link.
(Other definitions for inaccuracy that I've seen before include "Lack of correctness" , "Something wrong there" , "Mistake" , "error" .)