The place for plain clothes men? (4)
I believe the answer is:
yard
This clue could be a double definition.
'the place' is the first definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'plain clothes men?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'for' is the link.
Can you help me to learn more?
(Other definitions for yard that I've seen before include "Old unit of length" , "Unit of length; enclosure" , "Measure - enclosed paved area" , "Dray (anag.)" , "compound" .)