Crossword Genius

Awkward person puts it in propeller (3)

Ross

I believe the answer is:

This clue is a double definition.

'awkward person puts it in' is the first definition.
(an interfering person 'sticks their oar in')

'propeller' is the second definition.
(I've seen this before)

(Other definitions for oar that I've seen before include "spoon?", "Propelling blade", "Crewman", "Rower's paddle", "Manual boat propeller".)