Round, unaltered fertile area (5)

I believe the answer is:

oasis

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'fertile area' is the definition.
'oasis' can be an answer for 'area' (oasis is a kind of area). I am not sure about the 'fertile' bit.

'round unaltered' is the wordplay.
'round' becomes 'o' (o is a circular letter).
'unaltered' becomes 'asis' (ie something left 'as is').
'o'+'asis'='OASIS'

Can you help me to learn more?

(Other definitions for oasis that I've seen before include "Florist's foam" , "Manchester band featuring the Gallagher brothers" , "British band" , "Fertile place in a desert, watering-hole" , "place of relief" .)

I've seen this clue in The Times.

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