Poor migrants feeling sore (8)

I believe the answer is:

smarting

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

'feeling sore' is the definition.
'smarting' can be an answer for 'sore' (thesaurus). I am not sure about the 'feeling' bit.

'poor migrants' is the wordplay.
'poor' indicates an anagram.
'migrants' with letters rearranged gives 'SMARTING'.

Can you help me to learn more?

(Other definitions for smarting that I've seen before include "feeling the pain" , "suffering from sting" , "Painful" .)

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