Fish initially eating dragonflies after adult very quietly drew near (10)
I believe the answer is:
approached
'drew near' is the definition.
('approach' can be a synonym of 'draw near')
'fish initially eating dragonflies after adult very quietly' is the wordplay.
'fish' becomes 'roach' (roach is a kind of fish).
'initially' says to take the initial letters.
'after' means one lot of letters go next to another.
'adult' becomes 'a' (abbreviation).
'very quietly' becomes 'pp' (musical abbreviation for pianissimo).
The initial letters of 'eating dragonflies' is 'ed'.
'roach'+'ed'='roached'
'a'+'pp'='app'
'roached' put after 'app' is 'APPROACHED'.
(Other definitions for approached that I've seen before include "came closer" , "Drew near" .)