Small expanse of water Belloc handled, partly (6)

I believe the answer is:

lochan

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'small expanse' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'water belloc handled partly' is the wordplay.
'partly' indicates the answer is hidden within the clue (part of the clue is used).
'LOCHAN' is hidden in the letters of 'water belloc handled'.

'of' is the link.

Can you help me to learn more?

(Other definitions for lochan that I've seen before include "small lake" , "water in Scotland" , "small body of water" .)

I've seen this clue in The Times.

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