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Mum popular with Yank in principal street (4,4)

Ross

I believe the answer is:

main drag

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

'principal street' is the definition.
'main drag' can be an answer for 'street' (thesaurus). I am not sure about the 'principal' bit.

'mum popular with yank' is the wordplay.
'mum' becomes 'ma' (ma can mean mother).
'popular' becomes 'in' ('in' can mean trendy).
'with' is a charade indicator (letters next to each other).
'yank' becomes 'drag' (I've seen this before).
'ma'+'in'+'drag'='MAIN DRAG'

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Sun.
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