Crossword Genius

Ardent supporter outside in field (10)

Ross

I believe the answer is:

discipline

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

'field' is the definition.
(I know that field can be written as discipline)

'ardent supporter outside in' is the wordplay.
I cannot really understand how this works, but
'in' is within the answer.
The remaining letters 'disciple' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for discipline that I've seen before include "Correct" , "Field" , "Correction" , "Branch of knowledge; punish" , "Training designed to engender self-control" .)

I've seen this clue in The Telegraph.
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