They hold cold lanterns (6)
I believe the answer is:
'lanterns' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see a link between them that I don't see?
'they hold cold' is the wordplay.
I cannot quite understand how this works, but
'cold' could be 'c' (eg on taps) and 'c' is located in the answer.
The remaining letters 'lamps' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for clamps that I've seen before include "Devices to hold things, car wheels say" , "fasteners" , "Grips" , "Device to hold things, car wheels say" , "Devices to hold things firmly, car-wheels say" .)