Altering (8)

I think it could be either:

Which length description are you looking for?:

changing

'altering' is the definition.
('change' can be a synonym of 'alter')

This is the entire clue.

(Other definitions for changing that I've seen before include "Altering" , "Switching" , "Fluctuating" .)

I've seen this clue in The Telegraph and The Irish Times.

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