Fish taken on board quivers (6)
I believe the answer is:
shakes
'board quivers' is the definition.
'shakes' can be an answer for 'quivers' (I've seen this before). I'm unsure of the 'board' bit.
'fish taken on' is the wordplay.
'fish' becomes 'hake' (hake is a kind of fish).
'taken' becomes 'ss' (I can't justify this - if you can you should believe this answer much more).
'on' indicates putting letters inside (as in clothing \'on\' a person).
'hake' placed within 'ss' is 'SHAKES'.
Can you help me to learn more?
(Other definitions for shakes that I've seen before include "Quivers" , "jars" , "Moves quickly up and down, say milk drink" , "Judders" , "Frothy drink of milk and flavouring" .)