Hood for one to prepare in vestry (6,4)

I believe the answer is:

robing room

'vestry' is the definition.
(a vestry is a church robing room)

'hood for one to prepare' is the wordplay.
'hood' becomes 'Robin' (Robin Hood).
'for' is a charade indicator (letters next to each other).
'one to prepare' becomes 'groom' (eg grooming someone for a job).
'robin'+'groom'='ROBING ROOM'

'in' acts as a link.

I've seen this clue in The Times.

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