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

'fellow for thora hird?' is the wordplay.
'fellow' becomes 'man' (fellow can mean a man).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'thora' becomes 't' (this might be a standard abbreviation I've not previously seen).
't'+'hird'='third'
'man' after 'third' is 'THIRD MAN'.

'the' is the link.

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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