It hangs about in the cold (6)
I believe the answer is:
icicle
'it hangs about in the cold' is the definition.
The definition suggests a singular noun which matches the answer.
'it hangs about in the cold' is the wordplay.
I cannot quite see how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
'about' could be 'c' (abbreviation for circa) and 'c' is located in the answer.
'cold' could be 'c' (eg on taps) and 'c' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for icicle that I've seen before include "one that hangs on during a freeze" , "Hanging piece of ice" , "Spear of 23 down" , "Frozen finger of liquid" , "Frozen water drip" .)