Tracery to move agitatedly after corrosion (8)
I believe the answer is:
fretwork
'tracery' is the definition.
(thesaurus)
'move agitatedly after corrosion' is the wordplay.
I cannot really understand how this works, but
'move' could be 'work' (working is a kind of moving) and 'work' is found within the answer.
The remaining letters 'fret' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for fretwork that I've seen before include "Ornamental carving done with a saw" , "Design cut with a saw" , "Sawn ornamental design" , "Ornamental design done with saw" , "it's traced" .)