Stand in for Romeo priest found on top of woman (7)
I believe the answer is:
relieve
'stand in for' is the definition.
(thesaurus)
'romeo priest found on top of woman' is the wordplay.
'romeo' becomes 'R' (phonetic alphabet: alpha, bravo, charlie etc.).
'priest' becomes 'eli' (biblical figure).
'found on top of' is a charade indicator (letters next to each other).
'woman' becomes 'Eve' (Eve is an example).
'r'+'eli'+'eve'='RELIEVE'
(Other definitions for relieve that I've seen before include "Comfort" , "Assuage, ease" , "Take over work from someone" , "cure" , "Alleviate (eg, pain)" .)