Heartily contented group (3)

I believe the answer is:

ten

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'heartily contented group' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I can't see?

'heartily contented group' is the wordplay.
'heartily' indicates the answer is hidden within the clue (letters at the heart of the clue).
'TEN' can be found hidden inside 'contented group'.

Can you help me to learn more?

(Other definitions for ten that I've seen before include "PM's address, Downing St" , "Very young" , "Cardinal number" , "Figure" , "time" .)

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