Pray mid converts at the tomb (7)
I believe the answer is:
pyramid
'the tomb' is the definition.
(I've seen this before)
'pray mid converts' is the wordplay.
'converts' is an anagram indicator.
'pray'+'mid'='praymid'
'praymid' is an anagram of 'PYRAMID'.
'at' acts as a link.
(Other definitions for pyramid that I've seen before include "type of selling" , "Shape with square base and four triangular sides" , "Four sided monument" , "Massive Egyptian memorial" , "old monument" .)