Crossword Genius

He's in bother over this fellow (8)

Ross

I believe the answer is:

theodore

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'fellow' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'he's in bother over' is the wordplay.
'he' becomes 'Odo'.
'in' is an insertion indicator.
'bother over' becomes 'there' (I can't justify this - if you can you should believe this answer much more).
'odo' going inside 'there' is 'THEODORE'.

'this' acts as a link.

Can you help me to learn more?

(Other definitions for theodore that I've seen before include "Man" , "ex-president was named thus" , "... Roosevelt" .)

I've seen this clue in The Guardian.
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