Hero aching to net fish (5)

I believe the answer is:

roach

I'm a little stuck... Click here to teach me more about this clue!

'fish' is the definition.
(roach is a kind of fish)

'hero aching to net' is the wordplay.
'ROACH' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for roach that I've seen before include "butt" , "Silvery freshwater fish" , "member of family carp" , "Trim" , "Freshwatwer fish" .)

I've seen this clue in The Sun.

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