Prayer or stamps maybe this person’s interest? (9)
I believe the answer is:
collector
'stamps maybe this person's interest?' is the definition.
'collector' can be an answer for 'person's' (collector is a kind of person). I'm unsure of the rest of the definition.
'prayer or' is the wordplay.
'prayer' becomes 'collect' (collect is a type of prayer).
'collect'+'or'='COLLECTOR'
Can you help me to learn more?
(Other definitions for collector that I've seen before include "Accunulator, gatherer" , "Specimen gatherer" , "taxman?" , "Philatelist, e.g." , "Accumulator, gatherer" .)