Crossword Genius

Stick with a round exterior (3)

Ross

I believe the answer is:

rod

I'm a little stuck... Click here to teach me more about this clue!

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

'with a round exterior' is the wordplay.
'with' is an insertion indicator.
'a round' becomes 'o' (round can mean a round object).
'exterior' becomes 'rd' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o' put into 'rd' is 'ROD'.

Can you help me to learn more?

(Other definitions for rod that I've seen before include "Fisherman's item" , "Angler's pole" , "Flexible stick for 11 Down" , "Staff" , "Measurement" .)

I've seen this clue in the Evening Standard.
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