Crossword Genius

How an archaeologist with impractical footwear might show stubbornness? (3,2,4,5)

Ross

I believe the answer is:

dig in ones heels

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

'archaeologist with impractical footwear might show stubbornness?' is the definition.
I can't judge whether this defines the answer.

'how an' is the wordplay.
I cannot quite see how this works, but
'an' could be 'one' and 'one' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for dig in ones heels that I've seen before include "make an impression at grass-roots level?" , "Be very stubborn" .)

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app