They are served in many joints (5)

I believe the answer is:

chips

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'they are served' is the definition.
The definition suggests an adverb but the answer is not.

'many joints' is the wordplay.
'many' becomes 'c' (C is the Roman numeral for 100).
'joints' becomes 'hips' (hip is a kind of joint).
'c'+'hips'='CHIPS'

'in' is the link.

Can you help me to learn more?

(Other definitions for chips that I've seen before include "Fried potatoes" , "Flakes" , "Gambling counters" , "Betting counters" , "Goodbye, Mr -, novel" .)

I've seen this clue in the Evening Standard.

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