They hold up supper regularly during breaks (10)

I believe the answer is:

suspenders

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'they hold up' is the definition.
The definition suggests an adverb but the answer is not.

'supper regularly during breaks' is the wordplay.
'supper regularly' becomes 'er' (I can't explain this - if you can you should give a lot more credence to this answer).
'during' is an insertion indicator.
'breaks' becomes 'suspends' (suspending is a kind of breaking).
'er' inserted within 'suspends' is 'SUSPENDERS'.

Can you help me to learn more?

(Another definition for suspenders that I've seen is " braces".)

I've seen this clue in The Guardian.

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