Crossword Genius

Under control constructing water supply (4-2-4)

Ross

I believe the answer is:

well-in-hand

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

'under control' is the definition.
(thesaurus)

'constructing water supply' is the wordplay.
I cannot really understand how this works, but
'water' could be 'well' (well water is a kind of water) and 'well' is present in the answer.
The remaining letters 'inhand' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

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