It may feed you a little but tell you nothing (4)

I believe the answer is:

clam

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'it may feed you a little but tell you nothing' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for clam that I've seen before include "ringing noise produced by > very reticent type" , "Mollusc with tightly-closed shell" , "shy person" , "reticent person" , "Quahog" .)

I've seen this clue in the Evening Standard.

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