The other is heartened by it (5)

I believe the answer is:

aitch

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I can't explain the rest of the clue.

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(Other definitions for aitch that I've seen before include "It's dropped by Cockneys" , "that I will immediately succeed" , "what some drop?" , "Letter sound that's often dropped?" , "the start of hives?" .)

I've seen this clue in the Evening Standard.

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