Crossword Genius

Only part of a form? (5)

Ross

I believe the answer is:

fifth

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This might be a double definition.

'only part' is the first definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

'form?' is the second definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'of a' is the link.

Can you help me to learn more?

(Other definitions for fifth that I've seen before include "Musical interval" , "Fraction" , "(Of a monarch) V" , "Next after fourth" , "- Column is a group working for the enemy" .)

I've seen this clue in the Evening Standard.
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