Access a couple of pages on freshwater fish (8)
I believe the answer is:
approach
'access' is the definition.
('approach' can be a synonym of 'access')
'a couple of pages on freshwater fish' is the wordplay.
'couple of' shows that letters should be duplicated.
'pages' becomes 'p'.
'on' means one lot of letters go next to another.
'freshwater fish' becomes 'roach' (I've seen this before**).
'p' doubled is 'pp'.
'a'+'pp'+'roach'='APPROACH'
(Other definitions for approach that I've seen before include "Resemble" , "follows drive" , "Come near - means of access" , "Go towards" , "initial proposal" .)