People going to Silver Lake for animal collection (9)
I believe the answer is:
menagerie
'animal collection' is the definition.
(I've seen this before)
'people going to silver lake' is the wordplay.
'people' becomes 'men' (men are people).
'going to' means one lot of letters go next to another.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'lake' becomes 'erie' (Lake Erie is one of the Canadian/US 'Great Lakes').
'men'+'ag'+'erie'='MENAGERIE'
'for' acts as a link.
(Other definitions for menagerie that I've seen before include "Animals go in here" , "collected animals" , "[TENNESSEE WILLIAMS] work in part" , "lots of animals" , "strange collection of people" .)