For the radio engineer, something beautiful to behold (6)
I believe the answer is:
eyeful
'for' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for eyeful that I've seen before include "Fascinating sight" , "Interesting sight - beautiful woman" , "someone beautiful" , "beauty!" , "Long steady look at something" .)