Marshal stealing Doc Holliday's second adornment (7)

I believe the answer is:

eardrop

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'adornment' is the definition.
(eardrop is a kind of adornment)

'marshal stealing doc holliday's second' is the wordplay.
'marshal' becomes 'earp' (I can't justify this - if you can you should believe this answer much more).
'stealing' is an insertion indicator.
'doc' becomes 'Dr' (synonyms).
'holliday's second' becomes 'o' (and letter of 'holliday').
'dr'+'o'='dro'
'earp' going around 'dro' is 'EARDROP'.

Can you help me to learn more?

(Other definitions for eardrop that I've seen before include "little pendant" , "Piece of jewellery" , "Pendant earring" , "It depends" , "piece for listeners" .)

I've seen this clue in The Times.

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