Crossword Genius

Desert island with a water supply (5)

Ross

I believe the answer is:

oasis

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

'water supply' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'desert island with a' is the wordplay.
'desert' becomes 'os' (I can't justify this - if you can you should give a lot more credence to this answer).
'island' becomes 'is' (abbreviation).
'with' indicates putting letters inside.
'os'+'is'='osis'
'osis' placed around 'a' is 'OASIS'.

Can you help me to learn more?

(Other definitions for oasis that I've seen before include "A place of safety or sanctuary" , "Place of refreshment" , "Noel & Liam's band" , "Fertile area in desert" , "Peaceful area away from trouble" .)

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