Like something citrus maybe, giving help when cold is caught (4)
I believe the answer is:
acid
'like something citrus maybe' is the definition.
'help when cold is caught' is the wordplay.
I cannot quite understand how this works, but
'cold' could be 'c' (eg on taps) and 'c' is present in the answer.
'help' could be 'aid' (synonyms) and 'aid' is present in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
'giving' acts as a link.
(Other definitions for acid that I've seen before include "Corrosive fluid" , "Battery fluid" , "Polluted precipitation" , "Sour (substance)" , "Bitter substance" .)