Crossword Genius

Go fishing but keep in touch (4,1,4)

Ross

I believe the answer is:

drop a line

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

'touch' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?

'go fishing but keep in' is the wordplay.
I cannot quite see how this works, but
'in' is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for drop a line that I've seen is " Write".)

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