Crossword Genius

A record, in a sense, must be equivalent (9)

Ross

I believe the answer is:

analogous

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'equivalent' is the definition.
(thesaurus)

'a record in a sense' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
'record' could be 'log' (logging is a kind of recording) and 'log' is located in the answer.
This may be the basis of clue (or it may be nonsense).

'must be' is the link.

Can you help me to learn more?

(Other definitions for analogous that I've seen before include "corresponding" , "show correspondence" , "Eg, mastic" , "Comparable in certain respects" , "similar" .)

I've seen this clue in The Telegraph.
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