Devon runner, attractive, to perform (7)
I believe the answer is:
execute
'to perform' is the definition.
('execute' can be a synonym of 'perform')
'devon runner attractive' is the wordplay.
I cannot quite understand how this works, but
'runner' could be 'exe' (River Exe) and 'exe' is present in the answer.
'attractive' could be 'cute' (similar in meaning) and 'cute' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for execute that I've seen before include "Kill someone" , "shoot" , "Carry out - official killing?" , "Carry out, perform" , "murder..." .)