Crossword Genius

Masses of resistance in underwear (7)

Ross

I believe the answer is:

throngs

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

'masses' is the definition.
The definition and answer can be both groups as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'resistance in underwear' is the wordplay.
I cannot really understand how this works, but
'resistance' could be 'r' (electronics abbreviation) and 'r' is present in the answer.
'underwear' could be 'thong' (I have seen 'Skimpy underwear' mean 'thong' so perhaps 'underwear' could also mean 'thong') and 'thong' is found within the remaining letters.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

(Other definitions for throngs that I've seen before include "Crowds" , "Lots of people" .)

I've seen this clue in The Independent.
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