Touch number read as Arabic in church monument (8)
I believe the answer is:
Here is my best explanation:
'monument' is the definition.
(cenotaph is a kind of monument)
'touch number read as arabic in church' is the subsidiary indication.
'touch' becomes 'paton' (I can't explain this - if you can you should give a lot more credence to this answer).
'number' becomes 'e' (e is a kind of number).
'read as arabic' is a reversal indicator (Arabic is read from right to left).
'in' indicates putting letters inside.
'church' becomes 'ch' (common abbreviation).
'patone' back-to-front is 'enotap'.
'enotap' placed into 'ch' is 'cenotaph'.
(Other definitions for cenotaph that I've seen before include "Whitehall monument", "Monument honouring the fallen", "Empty tomb", "Whitehall memorial", "Monument built to honour soldiers who died in war", "Monument honouring persons buried elsewhere", "Monument to those killed in war", "Tomb-like monument to people buried elsewhere", "War memorial" and "Monument to the war dead".)