Support spymaster in nick
I believe the answer is:
armrest
'nick' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'support spymaster' is the wordplay.
'support' becomes 'arm' (arm is a kind of support).
'spymaster' becomes 'rest' (I can't explain this - if you can you should give a lot more credence to this answer).
'arm'+'rest'='ARMREST'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for armrest that I've seen before include "Support for one member" , "Support attached to the side of a chair" , "Part of a chair - smarter (anag)" , "Part of a chair, perhaps" , "Part of a carver chair" .)