Short row over exercise for model (6)
I believe the answer is:
sculpt
'for model' is the definition.
(I've seen this before)
'short row over exercise' is the wordplay.
'short' means to remove the last letter.
'row' becomes 'scull' (to scull is to row a boat with sculls).
'over exercise' becomes 'pt' (Physical Training. I am not sure about the 'over' bit.).
'scull' with its final letter taken away is 'scul'.
'scul'+'pt'='SCULPT'
Can you help me to learn more?
(Other definitions for sculpt that I've seen before include "Create a statue or similar stone work" , "Carve a statue" , "Create by shaping a material" , "Oak fruit" , "Model" .)