Wrath when fisherman loses heart (5)
I believe the answer is:
'wrath' is the definition.
'when fisherman loses heart' is the wordplay.
'when' becomes 'ang' (I can't explain this - if you can you should give a lot more credence to this answer).
'fisherman' becomes 'eeler' (I've seen this in another clue).
'loses heart' says to hollow out the word (remove centre letters).
'eeler' with its centre taken out is 'er'.
Can you help me to learn more?
(Other definitions for anger that I've seen before include "Irateness" , "Hack off" , "Rage" , "blaze of this?" , "Nettle" .)