Crossword Genius

In the field, just the fellow for Thora Hird? (5,3)

Ross

I believe the answer is:

third man

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

'in the field just the' is the definition.
I can't tell whether this definition defines the answer.

'fellow for thora hird?' is the wordplay.
'fellow' becomes 'man' (I've seen this before).
'for' means one lot of letters go next to another (I've seen this in other clues).
'thora' becomes 't' (this could be a standard abbreviation I've not previously seen).
't'+'hird'='third'
'man' put after 'third' is 'THIRD MAN'.

Can you help me to learn more?

(Other definitions for third man that I've seen before include "Cricket fielder - "The ___" (Orson Welles film)" , "Harry Lime" , "position in the field?" , "Cricket fielding position (for a spy?)" , "mysterious one in movie" .)

I've seen this clue in the Evening Standard.
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