Doddering in top position (5)
I believe the answer is:
point
'position' is the definition.
(I know that point is a more specific form of position)
'doddering in top' is the wordplay.
'doddering' is an anagram indicator (I've seen this in other clues).
'in'+'top'='intop'
'intop' with letters rearranged gives 'POINT'.
(Other definitions for point that I've seen before include "Indicate - off-side fielding position" , "Sharp or tapering end" , "Crux" , "Importance < of level" , "subject and > aim: > head" .)