Occasionally scarce farm product (5)
I believe the answer is:
cream
'product' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'occasionally scarce farm' is the wordplay.
'occasionally' means one should take alternating letters.
'scarce'+'farm'='scarcefarm'
The alternating letters of 'scarcefarm' are 'CREAM'.
Can you help me to learn more?
(Other definitions for cream that I've seen before include "Top of milk or society" , "It rises to the top, the best" , "Elite; pale yellow" , "An off-white shade" , "Fat-rich part of milk" .)