A fieldsman should never be thus shod! (4)

I believe the answer is:

slip

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'a fieldsman' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for slip that I've seen before include "Mistake; garment" , "See 16" , "Drop" , "He should take his chances" , "Clay, water mix; fielder" .)

I've seen this clue in the Evening Standard.

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