Irrational, pouring tea on religious image (5)
I believe the answer is:
pieta
'religious image' is the definition.
(image of the Virgin Mary holding Jesus' body)
'irrational pouring tea' is the wordplay.
I cannot quite see how this works, but
'irrational' could be 'pi' (an irrational number) and 'pi' is present in the answer.
an anagram of 'tea' is 'eta' which is within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'on' is the link.
Can you help me to learn more?
(Other definitions for pieta that I've seen before include "Sculpture of Mary with Christ's body" , "Tape I made of Mary and body of Jesus" , "(In painting etc) representation of the dead Christ" , "Post-Crucifixion scene sculpture" , "Religious figures" .)