Crossword Genius

Sailor steals one advanced piece of jewellery (5)

Ross

I believe the answer is:

tiara

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

'piece of jewellery' is the definition.
'tiara' can be an answer for 'jewellery' (tiara is a type of jewellery). I am unsure of the 'piece of' bit.

'sailor steals one advanced' is the wordplay.
'sailor' becomes 'tar' (slang term for a sailor).
'steals' indicates putting letters inside.
'one' becomes 'I' (Roman numeral).
'advanced' becomes 'a' (abbreviation).
'tar' going around 'i' is 'tiar'.
'tiar'+'a'='TIARA'

Can you help me to learn more?

(Other definitions for tiara that I've seen before include "Jewelled head wear" , "expensive headwear" , "Jewelled headwear" , "Jewelled crescent-shaped headdress" , "Pope's triple crown" .)

I've seen this clue in The Guardian.
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