Like a fish, very hard? No way (4)
I believe the answer is:
eely
'like a fish' is the definition.
I can't tell whether this defines the answer.
'very hard? no way' is the wordplay.
'very hard?' becomes 'steely' (I've seen this before).
'no' is a deletion indicator.
'way' becomes 'st' (abbreviation for street).
'steely' with 'st' taken out is 'EELY'.
Can you help me to learn more?
(Other definitions for eely that I've seen before include "Difficult to get hold of" , "Like a slippery catch" .)