Serious trouble distributing weed at rep (4,5)

I believe the answer is:

deep water

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

'serious trouble distributing weed at rep' is the definition.
I can't judge whether this definition defines the answer.

'distributing weed at rep' is the wordplay.
'distributing' is an anagram indicator.
'weed'+'at'+'rep'='weedatrep'
'weedatrep' anagrammed gives 'DEEP-WATER'.

Can you help me to learn more?

(Other definitions for deep water that I've seen before include "You're in a tricky position here" , "where you can't touch base" .)

I've seen this clue in The Independent.

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