Piece of land in Chiselhurst (4)

I believe the answer is:

isle

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'piece of land' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for isle that I've seen before include "inch, perhaps" , "Hawaii, perhaps" , "''There is an ..., a bonny ...'' (anthem of Shannon RFC)" , "eg Thanet" , "Small bit of land surrounded by water" .)

I've seen this clue in the Evening Standard.

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