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' anagrammed gives '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" .)