Early stage of development Dior abandoned after particular hesitation (10)

I believe the answer is:

primordium

'early stage of development' is the definition.
(organ in developing form)

'dior abandoned after particular hesitation' is the wordplay.
'abandoned' indicates an anagram (the original order is abandoned).
'after' is a charade indicator (letters next to each other).
'particular' becomes 'prim' (prim can mean precise or particular).
'hesitation' becomes 'um' (um is said in hesitation).
'dior' is an anagram of 'ordi'.
'ordi' after 'prim' is 'primordi'.
'primordi'+'um'='PRIMORDIUM'

I've seen this clue in The Times.

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