Tackle for a very quiet fish (8)
I believe the answer is:
approach
'tackle' is the definition.
(thesaurus)
'a very quiet fish' is the wordplay.
'very quiet' becomes 'pp'.
'fish' becomes 'roach' (roach is a kind of fish).
'a'+'pp'+'roach'='APPROACH'
'for' is the link.
(Other definitions for approach that I've seen before include "Go towards" , "attitude" , "Offer" , "Come near - means of access" , "Border on" .)