Quietly nod about puddle (4)
I believe the answer is:
pond
'puddle' is the definition.
(thesaurus)
'quietly nod about' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'about' indicates an anagram.
'nod' is an anagram of 'ond'.
'p'+'ond'='POND'
(Other definitions for pond that I've seen before include "Himalayan country" , "Small lake" , "Pool of still water" , "Small body of water" , "Possible site for weed" .)