Engineers agree with Ray, it's not a clear-cut issue (4,4)
I believe the answer is:
grey area
'issue' is the definition.
(I know that grey area is a type of area)
'engineers agree with ray' is the wordplay.
'engineers' indicates anagramming the letters (I've seen 'engineer' mean this).
'with' means one lot of letters go next to another.
'agree' after 'ray' is 'rayagree'.
'rayagree' anagrammed gives 'GREY AREA'.
'it's not a clear-cut' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for grey area that I've seen before include "One of unclear boundaries" , "where work is inadequate" , "One of undefined boundaries" , "not properly marked out" , "Retirement village" .)