Pelt I smuggled out (4)
I believe the answer is:
rain
'pelt' is the definition.
(thesaurus)
'i smuggled out' is the wordplay.
'smuggled' becomes 'ran' (I've seen this in other clues).
'out' means one lot of letters goes inside another.
'i' placed into 'ran' is 'RAIN'.
(Other definitions for rain that I've seen before include "The ---, it ---eth every day (T.Night)" , "Falling water" , "Come down in showers" , "eg A shower" , "Fall in large quantities" .)