Modest church seat, perhaps (6)
I believe the answer is:
chaste
'modest' is the definition.
(I've seen this in another clue)
'church seat perhaps' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'perhaps' indicates an anagram.
'seat' anagrammed gives 'aste'.
'ch'+'aste'='CHASTE'
(Other definitions for chaste that I've seen before include "avoiding relations" , "Morally pure" , "Pure and virginal" , "Like Diana" , "Untouched ..." .)