Young relatives from Italian capital involved in ceremonies (6)

I believe the answer is:

nieces

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

'young relatives' is the definition.
'nieces' can be an answer for 'relatives' (niece is a kind of relative). I am not sure about the 'young' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for nieces that I've seen before include "Young female relatives" , "They're related" , "Relatives of 27dn" , "Relations" , "They're family" .)

I've seen this clue in The Irish Times.

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