Small chap manually catching fish, a particular type (8)
I believe the answer is:
stickler
'a particular type' is the definition.
(I've seen this before)
'small chap manually catching fish' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'chap manually catching fish' becomes 'tickler' (someone catching fish with their hands).
's'+'tickler'='STICKLER'
(Other definitions for stickler that I've seen before include "Someone who insists on something" , "Perfectionist" , "One insistent on things being just so" , "One who insists on something, like punctuality" , "Trickles away for one who insists on" .)