Crossword Genius

To start, I had all you begin with relating to the water current (7)

Ross

I believe the answer is:

tidally

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'relating to the water current' is the definition.
I can't tell whether this defines the answer.

'to start i had all you begin' is the wordplay.
'start' means to remove the last letter (I've seen 'starts' mean this).
'i had' becomes 'i'd' (contraction).
'begin' says to take the initial letters.
The first letter of 'you' is 'y'.
'to' with its final letter removed is 't'.
't'+'id'+'all'+'y'='TIDALLY'

'with' acts as a link.

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