Crossword Genius

Happening to be catching flat-fish, I hear (6,5)

Ross

I believe the answer is:

taking place

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'happening' is the definition.
('take place' can be a synonym of 'happen')

'catching flat-fish i hear' is the wordplay.
'catching' becomes 'taking' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'flat fish' becomes 'plaice' (I've seen this before).
'i hear' shows a homophone (sound like).
'plaice' sounds like 'place'.
'taking'+'place'='TAKING PLACE'

'to be' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.
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