How a crab moves rocks, getting fish inside (8)
I believe the answer is:
sideways
'how a crab moves' is the definition.
I can't tell whether this definition defines the answer.
'rocks getting fish inside' is the wordplay.
'rocks' becomes 'sways' (I've seen this in another clue).
'getting' means one lot of letters goes inside another.
'fish inside' becomes 'ide' (type of fish. I am not sure about the 'inside' bit.).
'sways' placed around 'ide' is 'SIDEWAYS'.
Can you help me to learn more?
(Other definitions for sideways that I've seen before include "Obliquley, crabwise" , "Not backwards or forwards" , "Lateral movement" , "Movement of crab" , "Askance" .)