Church has second gentleman turning up for baptismal robe (7)
I believe the answer is:
chrisom
'baptismal robe' is the definition.
(robe worn by a baby at a baptism)
'church has second gentleman turning up' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'has' means one lot of letters go next to another.
'second' becomes 'mo' (both are short periods of time).
'gentleman' becomes 'sir' (I've seen this before).
'turning up' says the letters should be written backwards.
'mo'+'sir'='mosir'
'mosir' in reverse letter order is 'risom'.
'ch'+'risom'='CHRISOM'
'for' acts as a link.
(Other definitions for chrisom that I've seen before include "Oil" , "One-time baptismal robe" , "Garment" , "baptism robe" .)