Fish very quietly snared by man (5)
I believe the answer is:
guppy
'fish' is the definition.
(I've seen this before)
'very quietly snared by man' is the wordplay.
'very quietly' becomes 'pp'.
'snared by' is an insertion indicator.
'man' becomes 'guy' (guy is a kind of man**).
'pp' inserted into 'guy' is 'GUPPY'.
(Other definitions for guppy that I've seen before include "Tank occupant" , "Tropical fish" , "Aquarium fish" , "Small bright WI fish" , "Freshwater fish" .)