Together they may make a catch (3,3,4)

I believe the answer is:

rod and line

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'together they may' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'a catch' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

'make' is the link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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