Capriciously, I held child's ear and arms here (8,6)

I believe the answer is:

heraldic shield

I'm a little stuck... Click here to teach me more about this clue!

'arms here' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'capriciously i held child's ear' is the wordplay.
'capriciously' is an anagram indicator.
'i'+'held'+'childs'+'ear'='iheldchildsear'
'iheldchildsear' is an anagram of 'HERALDIC SHIELD'.

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app