Generally speaking (2,1,4)

I think it could be either:

Which length description are you looking for?:

2,1,4

as a rule

'generally speaking' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for as a rule that I've seen before include "Usually, in the normal course" , "how one might take a calibrated rod" , "Mainly" , "Generally, normally" , "Most of the time" .)

I've seen this clue in The Guardian.

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