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Slightly overestimate assembly (7)

Ross

I believe the answer is:

roundup

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This clue could be a double definition.

'slightly overestimate' is the first definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'assembly' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for roundup that I've seen before include "Gather together" , "Gathering of cattle or summary" , "Collection of facts" , "Gather into one place, animals or people" , "Summary (of events)" .)

I've seen this clue in The Times.
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