Crossword Genius

How angler might start to cause complications? (4,1,3,2,5)

Ross

I believe the answer is:

open a can of worms

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

'how angler might start to cause complications?' is the definition.
I can't judge whether this defines the answer.

'how angler might start to cause' is the wordplay.
I cannot really understand how this works, but
'might' could be 'can' and 'can' is found in the answer.
'start' could be 'open' (opening is a kind of starting) and 'open' is found in the answer.
'cause' could be 'ms' (Ms. is an example) and 'ms' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for open a can of worms that I've seen before include "give oneself problems" , "Prepare to bait line perhaps" .)

I've seen this clue in the Sydney Morning Herald.
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